若有4个并发进程共享某类资源，且每个进程需要3个此类资源，则使该系统不会发生死锁的最少资源数是（）。
A.6
B.7
C.8
D.9
参考答案：D
If the manager had to choose between the two, he would say John was ＿＿＿＿＿choice.
A．good
B．the best
C．better
D．the better
有如下赋值语句，结果为“大家好”的表达式是a="你好"B="大家"
A．b+AT(a,1)
B．b+RIGHT(a,1)
C．b+LEFT(a,3,4)
D．b+RIGHT(a,2)
