L型往复压缩机因两列连杆可以装在同一曲拐上，故一阶、二阶往复惯性力（）。
A、很大
B、很小
C、等于0
D、互相抵消
参考答案：B
-- Excuse me, Sir. You_________take your camera into the museum.
-- Sorry, I didn't know and I promise you I_________.
A．needn't; mustn't
B．can't; won't
C．mustn't; mustn't
D．may not; needn't
Jim would like to find _____ job because he doesn’t want to work here.
A. another B. the other C. one
