在各挡位下的功率(),将联合调节器动力活塞的作用顶杆缩短。
A、适中
B、不稳
C、偏高
D、偏低
参考答案:C
—I rang you at about nine, but there was no reply.
—Oh, that was probably__________I was seeing the doctor.
A.why
B.when
C.what
D.that
应用双摇杆机构的是()机构。
A.缝纫机踏板
B.车门启闭
C.汽车前轮转向
D.飞机起落架
E.汽车的自卸翻斗