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【单选题】
喹诺酮类药物的抗菌机制是A.
抑制DNA聚合酶
B.
抑制拓扑异构酶
C.
抑制肽酰基转移酶
D.
抑制DNA依赖的RNA多聚酶
E.
抑制DNA回旋酶
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反馈参考答案：
举一反三
【简答题】康师傅方便面,好吃看得见。
【单选题】It_______this way.
A.
is had to do
B.
is had to be done
C.
had to be done
D.
has to do
【单选题】—Tina had nothing for supper, _____ she? —_____. She had some bread and milk. [ ]
A.
had, Yes
B.
had, No
C.
did, Yes
D.
did, No
【单选题】They said at last that they ____ better start out at once. [ ]
A.
had had
B.
had
C.
had been
D.
was
【简答题】根据性质可将测量误差分为( ) 误差、( ) 误差和 粗大 误差。
【简答题】按测量误差的特点和性质分,可分为 、 和粗大误差三类。
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