从构效学上说,异丙肾上腺素致心律失常主要是由于()
A.侧链上的羰基
B.侧链上的羟基
C.侧链上的甲氧基
D.侧链上的甲氧基
E.侧链上的氨基
参考答案:B
选词填空.
1. this that
(1) _________is a pencil. Look ! It's over there.
(2)_________ is my book. The book is here.
(3)Mom, _______ is Sonia. Sonia, ________ is my mother.
2. no not
(1) -Is this your pencil?
- ________.It is ________.
(2) This is a dictionary. It's _________ a book.
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