为降低灌装过程的瓶颈空气,应适当提高装酒瓶内的备压,降低灌装温度。
参考答案:错
—Mr. Wang, must I come again to clean the window on Sunday morning?
—No, you _____ . I have asked others to do it.
A.don’t have to
B.mustn’t
C.can’t
D.shouldn’t
棚车适于运送较贵重和怕湿货物。()