题目内容

Watch the video clip in this chapter and choose the best answers for the following questions.When did Mac say "You are my hero." to her mother?

At a hotel room in Japan
B. In the street of Hiroshima
C. In the dinning room
D. At her mother's funeral

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更多问题

Watch the video clip in this chapter and fill in the following paragraph with what you hear.Though his speech, Marc wants to tell the audience that the truly important thing is how 1. ______ this gift of life is and how quickly our families could be 2. _. He no longer lives in time; he lives in 3. . It's what's in your 4. that matters, not in your pocket. Love is just a word until someone comes long and gives it 5. ____

机组运行过程中容易发生喘振的是（）压缩机。

A. 活塞式
B. 螺杆式
C. 离心式
D. 涡旋式

螺杆式冷水机组的制冷量范围为（）。

A. 100kw以下
B. 116-1758kw
C. 2000kw以上
D. 50kw以下

活塞式制冷机组的主要缺点为（）。

A. 运动部件多、寿命不长
B. 运动惯性大、振动大、噪声高
C. 单压缩机制冷量不大
D. 单位制冷量的重量大