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【单选题】
关于蛋白质的二级结构正确的是
A.
一种蛋白质分子只存在一种二级结构类型
B.
是多肽链本身折叠盘形成
C.
主要为α-螺旋和β-折叠结构
D.
二级结构类型及含量多少是由多肽链长短决定的
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参考答案：
举一反三
【单选题】某化合物Cl-CH2-CH2-CH2-Cl的1H NMR谱图上为
A.
2 组峰 : 1 个为三重峰 , 1 个为五重峰
B.
1 个单峰
C.
2 个单峰
D.
2 组峰 : 1 个为单峰 , 1 个为二重峰
查看完整题目与答案
【单选题】The man ______.
A.
threw his newspaper away
B.
offered them his newspaper
C.
dropped his newspaper
D.
did not take his newspaper with him
查看完整题目与答案
【单选题】The age of gilded youth (纨绔子弟) is over. Today' s under-thirties are the first generation for a century who can expect a lower living standard than their parents. Research into the lifestyle. and prosp...
A.
currently wealth flows from old generation to younger generation
B.
traditionally wealth flows from younger generation to old generation
C.
with the increasingly big population of over 50, the trend arises that wealth flows from younger generation to old generation
D.
with more and more people of over 50, traditions have been reversed
查看完整题目与答案
【简答题】女性，45岁，因绞窄性肠梗阻行急诊手术，发病前曾饱食。对该病人首选的麻醉方式是A、全身麻醉 B、硬膜外麻醉 C、蛛网膜下腔阻滞麻醉 D、颈丛神经阻滞 E、臂丛神经阻滞 该病人麻醉后完全清醒的标志是A、眼球活动 B、呼吸加快 C、呻吟、转动 D、睫毛反射恢复 E、能正确回答问题 病人可能发生的最严重的循环系统并发症是A、高血压 B、低血压 C、心搏停止 D、心房颤动 E、室性心律失常
查看完整题目与答案
【单选题】She almost threw up at his ________ to that benefactor’s patronizing tone.
A.
enlightenment
B.
covetousness
C.
reconciliation
D.
abjection
查看完整题目与答案
【简答题】The angel then turned to the third man, threw up his hands 73.
查看完整题目与答案
【简答题】根据句意，用方框中所给词的适当时态填空。 scream   clap   match   leave   stop    arrive 1. We all _____ our hands when they marched along the street. 2. I hear they _____ beijing this evening. 3. We all _____ because of ...
查看完整题目与答案
【简答题】Complete the sentences with the correct form of the verb in brackets. Present perfect or past perfect? 1 They had _____________ (hope) to organise a reception for their visitors, but it didn't come of...
查看完整题目与答案
【单选题】某化合物Cl-CH2-CH2-CH2-Cl的1H NMR谱图上为
A.
1 个单峰
B.
2 个单峰
C.
2 组峰 : 1 个为单峰 , 1 个为二重峰
D.
2 组峰 : 1 个为三重峰 , 1 个为五重峰
查看完整题目与答案
【多选题】为了使多根天线之间有较低的互相关性，通常采用的技术为（ ）
A.
空间分集
B.
极化分集
C.
时间分集
D.
频率分集
查看完整题目与答案
相关题目：
【单选题】某化合物Cl-CH2-CH2-CH2-Cl的1H NMR谱图上为
A.
2 组峰 : 1 个为三重峰 , 1 个为五重峰
B.
1 个单峰
C.
2 个单峰
D.
2 组峰 : 1 个为单峰 , 1 个为二重峰
查看完整题目与答案
【单选题】The man ______.
A.
threw his newspaper away
B.
offered them his newspaper
C.
dropped his newspaper
D.
did not take his newspaper with him
查看完整题目与答案
【单选题】The age of gilded youth (纨绔子弟) is over. Today' s under-thirties are the first generation for a century who can expect a lower living standard than their parents. Research into the lifestyle. and prosp...
A.
currently wealth flows from old generation to younger generation
B.
traditionally wealth flows from younger generation to old generation
C.
with the increasingly big population of over 50, the trend arises that wealth flows from younger generation to old generation
D.
with more and more people of over 50, traditions have been reversed
查看完整题目与答案
【简答题】女性，45岁，因绞窄性肠梗阻行急诊手术，发病前曾饱食。对该病人首选的麻醉方式是A、全身麻醉 B、硬膜外麻醉 C、蛛网膜下腔阻滞麻醉 D、颈丛神经阻滞 E、臂丛神经阻滞 该病人麻醉后完全清醒的标志是A、眼球活动 B、呼吸加快 C、呻吟、转动 D、睫毛反射恢复 E、能正确回答问题 病人可能发生的最严重的循环系统并发症是A、高血压 B、低血压 C、心搏停止 D、心房颤动 E、室性心律失常
查看完整题目与答案
【单选题】She almost threw up at his ________ to that benefactor’s patronizing tone.
A.
enlightenment
B.
covetousness
C.
reconciliation
D.
abjection
查看完整题目与答案
【简答题】The angel then turned to the third man, threw up his hands 73.
查看完整题目与答案
【简答题】根据句意，用方框中所给词的适当时态填空。 scream   clap   match   leave   stop    arrive 1. We all _____ our hands when they marched along the street. 2. I hear they _____ beijing this evening. 3. We all _____ because of ...
查看完整题目与答案
【简答题】Complete the sentences with the correct form of the verb in brackets. Present perfect or past perfect? 1 They had _____________ (hope) to organise a reception for their visitors, but it didn't come of...
查看完整题目与答案
【单选题】某化合物Cl-CH2-CH2-CH2-Cl的1H NMR谱图上为
A.
1 个单峰
B.
2 个单峰
C.
2 组峰 : 1 个为单峰 , 1 个为二重峰
D.
2 组峰 : 1 个为三重峰 , 1 个为五重峰
查看完整题目与答案
【多选题】为了使多根天线之间有较低的互相关性，通常采用的技术为（ ）
A.
空间分集
B.
极化分集
C.
时间分集
D.
频率分集
查看完整题目与答案
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