设备管线的盲板厚度应()管壁厚度。
A、略小于
B、不大于
C、不小于
D、等于
参考答案:C
When do you think we will leave tomorrow? You had better __ ready at seven o’clock.
A.to be
B.be
C.being
D.been
—Who helped you with your English?
—_______! I learned it all by myself. [ ]
A. Anybody
B. Somebody
C. Nobody
D. Everybody