卷扬机无论在什么条件下工作，留在卷筒上钢丝绳少于（）圈是不正确的。
A.1
B.2
C.3
D.4
参考答案：C, D
Judging from his IQ and his present state of study，he be admitted to Ts-inghua University this year if nothing special happens．
A．should
B．shall
C．can
D．must
计算机存储器中，组成一个字节的二进制位数是 (3) 。
A．4bits B．8bits C．26bits D．32bits
