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问题 单项选择题

十字花科蔬菜菌核病菌在田间气温适宜，相对湿度在（）以上时利于发病。

A、10%以上

B、50%以上

C、75%以上

D、85%以上

答案

参考答案：D

选择题
People were not allowed to enter the reading room because it _______.

A. had been painted
B. was being painted
C. was painting
D. painted
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多项选择题 X型题

心交感神经的作用特点是（）

A.心率加快

B.心率减慢

C.心肌收缩力增强

D.可被阿托品阻断

E.可被普萘洛尔阻断
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