()适用于承受较小冲击载荷的小尺寸零件,如活塞销、凸轮、齿轮等。
A.20Cr
B.20CrMnTi
C.18Cr2Ni4WA
D.20
参考答案:A
It is clear that your ____ English will greatly improve if you can practice ____ wherever you can.
A.speaking; speaking
B.speaking; spoken
C.spoken; speaking
D.spoken; spoken
Any information one wants to know about Liaoning Province Shiyan High School North School, just call 024-89293117. It ___ be simpler.
A.mustn't
B.won't
C.needn't
D.can't