根据客户的重要性可以将客户分为四类，其中（）约占客户总量的80%。
A.贵宾型客户
B.重要型客户
C.普通型客户
D.老客户
参考答案：C
Rosa knows she is the eldest of the three children in the family, and she must work hard to _______ the other two. So she does.
A．set an example to
B．make the most of
C．take a look at
D．play a trick on
溶剂的主要作用在于降低成膜物质的黏度，便于施工。( )
