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【多选题】
拟肾上腺素药物的构效关系包括( )A.
具有β-苯乙胺的结构骨架
B.
α - 碳上带有一个甲基，外拟肾上腺素作用减弱，中枢兴奋作用增强，作用时间延长
C.
N 上取代基对α和β受体效应的相对强弱有显著影响
D.
β - 碳上通常带有醇羟基，其绝对构型以S构型为活性体
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举一反三
【单选题】We suggest that you file a claim ____ the shipping company for all the losses incurred as a consequence of the failure to ship the goods ____ Order TC21 in time.
A.
against, unless
B.
for, under
C.
to, in
D.
against, under
【单选题】（ 15 ）邮政编码是由 6 位数字组成的字符串，为邮政编码设置输入掩码，正确的是
A.
） 000000
C.
） 999999 C ） CCCCCC
D.
） LLLLLL
【单选题】In the circumstances, we suggest that you return for replacement free _____ charge all the defective goods.
A.
for
B.
under
C.
of
D.
from
【单选题】In the circumstances, we suggest that you return for replacement free _____ charge all the defective goods.
A.
of
B.
from
C.
under
D.
for
【简答题】LP问题1.mp4 请同学们点开并观看视频并回答如下问题: 1、这个视频是哪部分内容? 2、LP是什么缩写?
【单选题】We all suggest that she _____ at the weekend, because her pale face suggests that she _____ in bad condition.
A.
does not work; is
B.
cannot work; was
C.
not worked; was
D.
not work; is
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