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【单选题】
留24h尿标本时加入甲醛的作用是
A.
固定尿中有机成分
B.
防止尿液中的激素被氧化
C.
防止尿液被污染变质
D.
保持尿液中的化学成分
E.
防止尿液改变颜色
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参考答案：
举一反三
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She monitored the brain activity of participants sleeping in a new environment.
B.
She recruited 35 participants from her Department of Psychological Sciences.
C.
She studied the differences between the two sides of participants’ brains.
D.
She tested her findings about birds and dolphins on human subjects.
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【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She analyzed the negative effect of irregular tones on brains.
B.
She recorded participants’ adaptation to changed environment.
C.
She exposed her participants to two different stimuli.
D.
She compared the responses of different participants.
查看完整题目与答案
【单选题】A diffraction pattern is produced on a viewing screen by illuminating a long narrow slit with light of wavelength λ. If the slit width is decreased and no other changes are made
A.
the intensity at the center of the pattern decreases and the pattern expands away from the bright center
B.
the intensity at the center of the pattern increases and the pattern contracts toward the bright center
C.
the intensity at the center of the pattern does not change and the pattern expands away from the bright center
D.
the intensity at the center of the pattern does not change and the pattern contracts toward the bright center
查看完整题目与答案
【单选题】Studies of the effect that makes many of us slumber or feel sleepy during the queen’s speech on Christmas Day have revealed that changes may be required in Britain’s drink drive legislation. Dr. James...
A.
like to take a short nap after lunch
B.
don’t take a short nap after lunch
C.
don't feel sleepy after lunch
D.
like to sleep twice a day
查看完整题目与答案
【多选题】甲、乙、丙、丁欲设立一有限合伙企业，合伙协议中约定了如下内容，其中符合合伙企业法律制度规定的有( )。
A.
甲仅以出资额为限对企业债务承担责任，同时被推举为合伙事务执行人
B.
丙以其劳务出资，为普通合伙人，其出资份额经各合伙人商定为5万元
C.
合伙企业的利润由甲、乙、丁三人分配，丙仅按营业额提取一定比例的劳务报酬
D.
经全体合伙人同意，有限合伙人可以全部转为普通合伙人，普通合伙人也可以全部转为有限合伙人
查看完整题目与答案
【单选题】According to Dr. Nell, what is the most noticeable effect of smaller families?
A.
There is less mixing of ages in smaller families.
B.
Children can get more affection from their parents.
C.
Children can live in a more loving environment.
D.
Children are able to enjoy better living condition.
查看完整题目与答案
【单选题】患者，男性，40岁，左下肢肿胀伴疼痛四天，B超示左股静脉血栓形成，在家属扶助下步行入院，其最严重的并发症为
A.
肺动脉栓塞
B.
丧失劳动能力
C.
下肢静脉曲张
D.
下肢溃疡
E.
下肢严重水肿，坏死
查看完整题目与答案
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She found birds and dolphins remain alert while asleep.
B.
She found birds and dolphins sleep in much the same way.
C.
She got some idea from previous studies on birds and dolphins .
D.
She conducted studies on birds’ and dolphins’ sleeping patterns.
查看完整题目与答案
【简答题】Two narrow slits 80 mm apart are illuminated with light of wavelength 600 nm. What is the angle of the m = 3 bright fringe in radians?
查看完整题目与答案
【简答题】Light of wavelength 600 nm illuminates a diffraction grating. The second-order maximum is at angle . How many lines per millimeter does this grating have?
查看完整题目与答案
相关题目：
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She monitored the brain activity of participants sleeping in a new environment.
B.
She recruited 35 participants from her Department of Psychological Sciences.
C.
She studied the differences between the two sides of participants’ brains.
D.
She tested her findings about birds and dolphins on human subjects.
查看完整题目与答案
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She analyzed the negative effect of irregular tones on brains.
B.
She recorded participants’ adaptation to changed environment.
C.
She exposed her participants to two different stimuli.
D.
She compared the responses of different participants.
查看完整题目与答案
【单选题】A diffraction pattern is produced on a viewing screen by illuminating a long narrow slit with light of wavelength λ. If the slit width is decreased and no other changes are made
A.
the intensity at the center of the pattern decreases and the pattern expands away from the bright center
B.
the intensity at the center of the pattern increases and the pattern contracts toward the bright center
C.
the intensity at the center of the pattern does not change and the pattern expands away from the bright center
D.
the intensity at the center of the pattern does not change and the pattern contracts toward the bright center
查看完整题目与答案
【单选题】Studies of the effect that makes many of us slumber or feel sleepy during the queen’s speech on Christmas Day have revealed that changes may be required in Britain’s drink drive legislation. Dr. James...
A.
like to take a short nap after lunch
B.
don’t take a short nap after lunch
C.
don't feel sleepy after lunch
D.
like to sleep twice a day
查看完整题目与答案
【多选题】甲、乙、丙、丁欲设立一有限合伙企业，合伙协议中约定了如下内容，其中符合合伙企业法律制度规定的有( )。
A.
甲仅以出资额为限对企业债务承担责任，同时被推举为合伙事务执行人
B.
丙以其劳务出资，为普通合伙人，其出资份额经各合伙人商定为5万元
C.
合伙企业的利润由甲、乙、丁三人分配，丙仅按营业额提取一定比例的劳务报酬
D.
经全体合伙人同意，有限合伙人可以全部转为普通合伙人，普通合伙人也可以全部转为有限合伙人
查看完整题目与答案
【单选题】According to Dr. Nell, what is the most noticeable effect of smaller families?
A.
There is less mixing of ages in smaller families.
B.
Children can get more affection from their parents.
C.
Children can live in a more loving environment.
D.
Children are able to enjoy better living condition.
查看完整题目与答案
【单选题】患者，男性，40岁，左下肢肿胀伴疼痛四天，B超示左股静脉血栓形成，在家属扶助下步行入院，其最严重的并发症为
A.
肺动脉栓塞
B.
丧失劳动能力
C.
下肢静脉曲张
D.
下肢溃疡
E.
下肢严重水肿，坏死
查看完整题目与答案
【单选题】Questions 11 and 15 are based on the following passage. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the “first-night” effect....
A.
She found birds and dolphins remain alert while asleep.
B.
She found birds and dolphins sleep in much the same way.
C.
She got some idea from previous studies on birds and dolphins .
D.
She conducted studies on birds’ and dolphins’ sleeping patterns.
查看完整题目与答案
【简答题】Two narrow slits 80 mm apart are illuminated with light of wavelength 600 nm. What is the angle of the m = 3 bright fringe in radians?
查看完整题目与答案
【简答题】Light of wavelength 600 nm illuminates a diffraction grating. The second-order maximum is at angle . How many lines per millimeter does this grating have?
查看完整题目与答案
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