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【多选题】
根据辐射能量传递方式,光谱可分为( )。(此题为多选题)
A.
发射光谱法
B.
吸收光谱法
C.
X 射线衍射法
D.
拉曼光谱法
E.
荧光光谱法
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【简答题】Green Gene Technology For the past 10,000 years humans have influenced the plants they use at first unknowingly, later by design. Today's crops have been created by a process of selection and classica...
【单选题】某天然黑灰色弧面型戒面,有猫眼效应,折射率1.54(点测),密度2.65g/cm3,它应该是
A.
猫眼
B.
石英猫眼
C.
辉石猫眼
【简答题】The reading of all good books is like a conversation with the finest men of the past centuries.
【单选题】幼儿发生挫伤后,( )可进行热敷。
A.
6小时后
B.
12小时后
C.
18小时后
D.
24小时后
【单选题】In the past most pilots have been men, but today the number of women ______ this field is climbing.
A.
shamming
B.
devoting
C.
registering
D.
pursuing
【单选题】Over the past century, the composition of the human gene pool ______ appreciably.
A.
did not change
B.
has not changed
C.
was not changed
D.
had not changed
【单选题】为研究新药A治疗胃病疗效,在某医院选择40例胃病患者,随机分成实验组和对照组,实验组用药A,对照组用公认有效的药B。这种对照在实验设计中称为( )
A.
实验对照
B.
空白对照
C.
标准对照
D.
历史对照
【单选题】Windows 7第一次连接到网络时必须选择网络位置,根据所处的环境不同,我们可以选择 ( )。
A.
家庭网络
B.
工作网络
C.
公用网络
D.
以上都可以
【单选题】研究新药A治疗胃病疗效,在某医院选择40 例胃病患者,随机分成实验组和对照组,实验组用药 A,对照组用公认有效的药B。这种对照在实验设计中称为( )
A.
实验对照
B.
空白对照
C.
标准对照
D.
历史对照
【简答题】补全对话. S:I've just been to the English Corner: T: 1 Did you talk with Ben and Andy? S: 2 And I'm not sure if they understood me. T: 3 You have had a good start. S: But I'm afraid of mistakes whe...
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