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【判断题】
当直线与X轴平行或重合时,倾斜角为180度A.
正确
B.
错误
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【单选题】听力原文：W: Air pollution is one of the most serious problems in the world. Polluted air can make us sick or even kill us. Why isn't more done to stop it? M: Everyone wants to stop it, but it is a difficu...
A.
Most people don't think it is a serious problem.
B.
Most of our pollution is caused by things people need.
C.
The government has not spent enough money to stop it.
D.
The seriousness of pollution has not been realized by the government.
【多选题】With regard to air waybill, the correct statements include ( ).
A.
It is a form of bill of lading used for the air transport of goods .
B.
It is negotiable.
C.
It does not evidence title to the goods.
D.
In a letter of credit payment situation it should not be required to be issued “to order”.
【单选题】They regard ______ as their duty to provide the best service for their customers.
A.
this
B.
what
C.
it
D.
that
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