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【单选题】
液压泵将机械能转变为液压油的( )；而液压缸又将这能量转变为工作机构运动的机械能。A.
电能
B.
液压能
C.
机械能
D.
压力能
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【简答题】Mr. and Mrs. Green were going on their vacation with their children, and they had to arrive at the airport before 11:40 the next morning. “It takes us thirty minutes to get there in a car,” Mr. Green ...
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【简答题】merge
【单选题】按电子计算机传统的分代方法,第一代至第四代计算机依次是
A.
机械计算机 、 电子管计算机、晶体计算机、集成电路计算机
B.
手摇机械计算机、电动机计算机、电子管计算机、晶体计算机
C.
电子管计算机、晶体管计算机、中规模集成电路计算机、大规模和超大规模集成电路计算机
D.
晶体管计算机、集成电路计算机、大规模集成电路计算机、光器件计算机
【简答题】阅读理解。 There is an old English saying. It tells us that we must go to bed early and get up early in the morning. Then we shall be healthy. We shall also be rich and clever. This is true. The body must ...
【单选题】There are hundreds of expressions of words using “hand” in the English language. Let us examine some of the expressions that use “hand”. We will get a hand in this way. “To get a hand in” is to begin ...
A.
get out of hand
B.
get a hand in
C.
lend a hand
D.
take a hand in
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【单选题】merge
A.
an instance of buying or selling something; a business deal
B.
something that you can choose to have or do
C.
idea; thought
D.
join or combine
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