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【单选题】
在计算机操作系统中,若wait,signal操作的信号量S初值为2,当前值为-1,则表示有____个等待进程。A.
0
B.
1
C.
2
D.
3
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反馈参考答案：
举一反三
【简答题】物业管理的基本特征包括（ ）。
【简答题】对象是人们要研究的任何事物,主要的对象类型有
【简答题】下列哪些表达式不可以作为循环条件( )
【单选题】All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
A.
had been canceled
B.
have been canceled
C.
were canceled
D.
having been canceled
【简答题】All flights ________ because of the snowstorm, many passengers could do nothing but take the train. A) had been canceled B) have been canceled C) were canceled D) having been canceled
【单选题】What could the girl in the ticket office do for the passengers without asking the computer?
A.
She could sell a ticket.
B.
She could write out a ticket.
C.
She could answer the passengers' questions.
D.
She could do nothing.
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