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【单选题】
Most diets fail to understand that_______.A.
insufficient intake of carbohydrates places their health at a risk
B.
they should avoid foods containing carbohydrates if they hope to lose weight
C.
mental llness is mainly caused by lack of carbohydrates in the body
D.
the more they have foods containing carbohydrates, the healthier they are
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【单选题】(2016•宿迁)-The women badminton players won the Uber Cup. -_______
A.
What a pity!
B.
With pleasure
C.
Never mind.
D.
I'm glad to hear that.
【单选题】关于十字头式柴油机下列说法正确的是( )。
A.
理论上活塞与缸套不接触,所以缸套的磨损不是摩擦造成的,而是腐蚀造成的
B.
十字头的导板固定在机座上
C.
活塞杆与十字头的连接有在十字头上部用螺钉固定和十字头下部用螺母固定两种方式
D.
气缸套不受侧推力,所以机体无横向振动
【简答题】矢量场对有向曲面的面积分称为矢量场通过该有向曲面的( )。
【单选题】关于十字头式柴油机下列说法正确的是（）。
A.
理论上活塞与缸套不接触，所以缸套的磨损不是摩擦造成的，而是腐蚀造成的
B.
十字头的导板固定在机座上
C.
活塞杆与十字头的连接有在十字头上部用螺钉固定和在十字头下部用螺母固定两种方式
D.
气缸套不受侧推力，所以机体无横向振动
【单选题】听力原文：M: What do you think? Should I accept this exchange program and head off to Japan for three months? W: Are you serious? Everyone I know is lining up to go there and you' re actually considering n...
A.
The opportunity is too rare to pass over.
B.
He should line up for the program as others do.
C.
He should concentrate on his studies.
D.
He should consider going together with others.
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