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【单选题】
关于制冷装置检漏，下列说法错误的是（）A.
皂液检漏法不适合在低温库内检漏
B.
卤素检漏灯不适合R134a检漏
C.
任何制冷剂从缝隙处漏泄，留下油迹
D.
卤素检漏灯用不宜将调节阀关太紧
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【简答题】The first tennis balls ______ (是由皮革里面塞满羊毛或是毛发制成的).
【单选题】Which of the following would not cause an increase in demand for tennis balls?
A.
a reduction in the price of tennis racquets
B.
a decrease in the price of tennis balls
C.
an unusually sunny fall and winter
D.
an increase in the popularity of tennis
【简答题】阅读理解。 Life is like throwing and catching four balls of life in the air．You call the balls work,family,friends and minds．You will soon understand that work is a rubber ball．If you drop it,it will bo...
【单选题】The boiler feed pump discharge pressure is higher than the steam drum pressure to _____.
A.
ensure feed water flow into the boiler
B.
keep the steam drum pressure high
C.
prevent water hammer in the feed line
D.
help the feed water flash to steam
【简答题】If the supply of tennis balls, a complement to tennis racquets, decreases, what will happen to the equilibrium price of tennis balls and to the equilibrium price of tennis racquets?
【单选题】Tigers ____ meat-eating animals ____ meats. [ ]
A.
belonged to; feed on
B.
belonging to; feed on
C.
were belonged to; are fed on
D.
belonging to; are fed on
【单选题】What does the author mean by saying 'you are throwing part of a tree' (line 2, para 2)?
A.
We are tired of the part of a tree.
B.
We are throwing away paper bags.
C.
We are using too much wrapper paper.
D.
We are wasting our precious materials.
【单选题】Which of the following would DECREASE the demand for tennis balls?
A.
An increase in the price of tennis balls
B.
A decrease in the price of tennis rackets
C.
An increase in the cost of producing tennis balls
D.
A decrease in average household income when tennis balls are a normal good
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