If you travel in a foreign country, a tour__ may save you a lot of trouble()
A. director
B. helper
C. guide
D. assistant
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螺纹的五要素分别是()
A. 牙型,公称直径,线数,螺距和导程,旋向
B. 断面形状,螺杆粗细,长度,标准,旋转方向
C. 牙型,大径,线数,螺距,旋向
D. 牙型,大径或小径,头数,导程,旋向
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