以下关于UML的表述中，不正确的是（） A．UML是一种文档化语言 B．UML是一种

Keep on trying, ______you’ll succeed ___________

A．and; on time

B．or; at one time

C．and; in time

D．or; all the time

I have done everything _____ was possible to do to prevent him from _____ the risk but in vain. [ ]

A. it; cutting

B. that; running

C. that; cutting

D. it; running

---- May I smoke here?

---- If you      , choose a seat in the smoking section

A．should

B．could

C．must

D．may

在资本自由流动和浮动汇率制的条件下，宏观经济政策中的( )是无效的。

A．财政政策
B．货币政策
C．产业政策
D．反垄断政策

银企合作中，以授信额度协议来对待的贷款安排属于贷款意向书性质。