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【单选题】
按照《 2010 年通则》的解释,下列贸易术语中,由卖方负责办理进口通关手续的是( )。A.
DAT
B.
DAP
C.
DDP
D.
EXW
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皮皮学刷刷变学霸
举一反三
【简答题】维生素B1的活性形式为（），它是（）的辅酶。维生素D没有活性，须经（）转化为（）后，才具有活性。
【单选题】A low in a marine weather report is an air pressure system the pressure at the center of which is ______.
A.
the highest over the area
B.
the lowest over the area
C.
higher than 1013 HPA
D.
lower than 1013 HPA
【单选题】Compared to a low pressure system，generally the air in a high is ().
A.
Warmer，less dense，and less stable
B.
Cool，more dense，and drier
C.
Muggy and cloudy
D.
Extremely moist with high relative humidity
【单选题】Broken valve strips in an operating low pressure, air compressor will cause _____.
A.
an immediate crankcase explosion
B.
oil contamination in the compressed air
C.
a decrease in compressor capacity
D.
no immediate loss of the compressed air capacity
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