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【单选题】
当心、谨防A.
behalf
B.
be aware
C.
beware
D.
behavior
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皮皮学刷刷变学霸
举一反三
【简答题】试述输血过敏反应的原因和护理措施。
【单选题】We see that the Netherlands, Belgium, and Ireland trade considerably more with the United States than with many other countries.
A.
This is explained by the gravity model, since they do not share borders.
B.
This is explained by the gravity model, since these are all large countries.
C.
This is explained by the gravity model, since these are all small countries.
D.
This fails to be consistent with the gravity model, since these are small countries.
E.
This fails to be consistent with the gravity model, since these are large countries.
【单选题】如下形式的二阶系统：【图片】，当阻尼比大于0.707时，下述说法正确的是
A.
不存在谐振峰值，因此阶跃响应也没有超调
B.
不存在谐振峰值，但阶跃响应可能会有超调
C.
存在谐振峰值，但阶跃响应没有超调
D.
存在谐振峰值，阶跃响应也一定有超调
【单选题】青霉素G钠在室温弱酸性条件发生何反应（）
A.
分解成青霉噻唑酸
B.
6-氨基上酰基侧链水解
C.
β-内酰胺环的水解开环
D.
发生分子重排
E.
钠盐被酸中和成游离羧酸
【简答题】从蚯蚓的横切面观察,可见体壁由自外向内5层组成()、()、()、()、()。
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