皮皮学，免费搜题
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【单选题】
引起菌群失调的原因是由于A.
正常菌群种类发生改变
B.
正常菌群寄生部位改变
C.
正常菌群之间比例改变
D.
正常菌群耐药性的改变
E.
正常菌群遗传性状改变
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The doctor answered that ______.
A.
he knew the young man was dirty
B.
it was true that the young man was ill
C.
soap and water were not good fo his illness
D.
he knew the young man never washed his body
【简答题】JT4系列为交流通用继电器,在这种继电器的电磁系统上装设不同的线圈,便可制 成 、 、 或 继电器 。
【简答题】刷牙时间不足___分钟，即为无效刷牙。
【单选题】The young man was greatly taken aback by the news that the police intended to prosecute him.
A.
astonished
B.
disturbed
C.
stumbled
D.
baffled
【单选题】The young man was deeply hurt because his proposal was rejected and, to a certain extent, ______ at by the group's members.
A.
sneered
B.
smiled
C.
simulated
D.
stimulated
【简答题】JT4系列为交流通用继电器,在这种继电器的电磁系统上装设不同的线圈,便可制成(............) 、(............) 、(............) 或(............) 等继电器。
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