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【单选题】
X62W 万能铣床上,由于主轴传动系统中装有(), 为减小停车时间,必须采取制动措施。A.
摩擦轮
B.
惯性轮
C.
电磁离合器
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【单选题】After they married, they decided to move back to the village and _______. [ ]
A.
bring down
B.
calm down
C.
put down
D.
settle down
【单选题】—Would you mind _______ your car? —No, not at all. [ ]
A.
to move
B.
moving
C.
move
D.
moved
【单选题】A ____ on the side of a window helps you move a document or graphic up and down within the window.
A.
menu bar
B.
task bar
C.
status bar
D.
scroll bar
【单选题】______ makes the piston to move up and down in the engine cylinder.
A.
pressure changes
B.
piston head
C.
atmospheric pressure
D.
mechanical force
【单选题】听力原文：A: How would you like to move? B: Move? What do you mean? A: Move to a new city. I'm thinking of getting another job. B: But why? What's matter with the one you have? A: I don't have a good futur...
A.
It's too hot.
B.
It's too humid.
C.
It snows too much.
D.
It snows too little.
【单选题】Opportunity costs most often increase as you move down a production possibilities frontier because ( ) .
A.
resources are not completely adaptable to alternative uses
B.
factors of production are limited and human wants are unlimited
C.
efficiencies are generated by large-scale production
D.
economic efficiency is only possible in the short run
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