幽门梗阻患者洗胃宜用()
A.清水
B.3%盐水
C.0.95氯化钠溶液
D.1:5000高锰酸钾溶液
E.2%~4%鞣酸溶液
参考答案:B
The manager listened to the customers’ complaints attentively with great patience, _______ to miss any point.
A.not trying
B.trying not
C.to try not
D.not to try
简述CIF与CIP贸易术语的主要区别。