ZB25/ZB45包装机输送槽中有变形烟包将输送槽阻塞或烟包数量过多机器则显示“主输送槽阻塞”故障。
参考答案：对
The importance of delivery on time ( ) overstressed, because failure to receive goods or services will cause serious inconvenience to the end-users.
A．can
B．be
C．cannot be
D．could be
下列哪项不是妊娠早期常见的表现：（）
A.头晕畏食
B.择食嗜酸
C.恶心呕吐
D.倦怠思睡
E.口淡欲呕
