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。（）
