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【单选题】
下列关于阈值的叙述,正确的是
A.
阈值即阈电位
B.
是指能引起组织发生兴奋的最小刺激强度
C.
与组织兴奋的难易程度无关
D.
组织兴奋性高低与阈值呈正比关系
E.
是引起组织产生动作电位的最大刺激强度
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【单选题】巴比妥类药物的母核结构为( )
A.
乙内酰脲
B.
丙二酰脲
C.
氨基醚
D.
吡唑酮
【单选题】巴比妥类药物的母核结构为。( )
A.
环己烯
B.
喹啉环
C.
丙三醇
D.
丙二酰脲
E.
双缩脲
【单选题】巴比妥类药物的母核结构为( )
A.
环己烯
B.
喹啉环
C.
丙三醇
D.
丙二酰脲
【单选题】On no account ______ ever leave the baby at home alone.
A.
should you
B.
you should
C.
shall you
D.
you shall
【简答题】________是国家信息中心以打造国家经济形势晴雨表为目标推出的一个全面反映我国经济运行态势和经济政策变动的海量信息平台。
【单选题】The possible meaning of the sentence “You should know better than to leave your little sister at home by herself” is _________.
A.
You should be wise enough not to leave your little sister at home by herself.
B.
You should be wise enough to leave your little sister at home by herself.
C.
You should leave your little sister at home by herself.
D.
You should stay at home.
【判断题】不牺牲自己利益的让步是没有的。( )
A.
正确
B.
错误
【单选题】巴比妥类药物的母核结构为()。
A.
环已烯
B.
B、啉环
C.
C、丙三醇
D.
丙二酰脲
【多选题】Why should you leave adequate time when you trasfer in the stopover?
A.
Sometimes you need to change ternimals.
B.
You should need enough time to go through the security check.
C.
You need time to shop at the duty-free shop.
D.
You need time to meet some friends.
【单选题】When you want to leave your present job, you should write a letter ______.
A.
refusing a job offer
B.
requesting references
C.
of application
D.
of resignation
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