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【单选题】
MCS-51有4个并行I\O口,其中P0~P3是准双向口,所以由输出转输入时必须先写入( )。A.
作为普通IO口输入时，无须考虑“准”双向口的限制
B.
作为总线来使用时，其输出驱动电路为推拉式电路结构，负载能力高
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【简答题】Traffic jams often build up when drivers to see what happened in a crash.
【简答题】Correct errors, if any, in the following sentences from 21-40. The scholars met once a year to exchange experiences.
【单选题】Traffic jams often build up when drivers to see what happened in a crash.
A.
slow at
B.
slow down
C.
slow on
D.
slow in
【单选题】____ means a female graduate of a school, college, etc.
A.
Alumnae
B.
Alumna
C.
Alumni
D.
Alumnus
【简答题】Correct errors, if any, in the following sentences:Open to all anglers (垂钓者) this is a form of fishing.
【简答题】Correct errors, if any, in the following sentences:That was a red-carpet room.
【简答题】Correct errors. if any, in the following sentences: Just take a took at that fellow, so you'll get sick.
【简答题】Correct errors. if any, in the following sentences: The admen ( 广告员 ) not only convince the reader that the Continental is a luxury car but also that the car confers status on its owner.
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