猩红热的主要传播途径是()
A.空气飞沫传播
B.接触污染的食物与用具
C.皮肤伤口
D.产妇的产道
E.脱皮期的脱屑
参考答案:A
什么是给水泵?
Emphasis has to be laid on the point ______ shipment must be made within the validity of the L/C.( )
A.what
B.which
C.that
D./