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【判断题】
凡按正弦规律变化的电压电流都称为正弦量A.
正确
B.
错误
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【简答题】小题1:Many athletes won gold medals in the Olympics, they are our national h__________. 小题2:Tom didn’t finish _____________( write) his test because he ran out of the time. 小题3:The girl is a mode...
【单选题】It is known to us that it was such great efforts _______ all the Chinese athletes had made _______ helped them get 51 gold medals in the 2008 Beijing Olympic Games. [ ]
A.
as, that
B.
that, which
C.
that, as
D.
which, which
【单选题】Although there were only five athletes ____ in the race, it was a rather exciting one.
A.
competing
B.
having been competed
C.
to compete
D.
to be competed
【多选题】P、V操作是操作系统提供的具有特定功能的原语。利用P、V操作可以( )。
A.
保证系统不发生死锁
B.
实现资源的互斥使用
C.
推迟进程使用共享资源的时间
D.
提高资源利用率
E.
协调进程的执行速度
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