The machine will continue to make much noise_we have it repaired()
A. when
B. because
C. if
D. unless
The old man has two daughters,__ are doctors()
A. both of them
B. both of whom
C. both who
D. they both
若有以下程序段int r=8;printf(“%d”,r>>1);输出结果是()
A. 16
B. 8
C. 4
D. 2
防止螺纹()损坏和便于(),将螺纹的起始处加工成()或()形式
A. 尾部,加工,倒角,退刀槽
B. 尾部,装配,倒圆,倒角
C. 起始圆,加工,倒角,退刀槽
D. 起始圆,装配,倒角,倒圆