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【单选题】
点 M (3，-3，1)关于 y 轴的对称点是( )A.
(-3，3，-1)
B.
(-3，-3，-1)
C.
(3，-3，-1)
D.
(-3，3，1)
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反馈参考答案：
举一反三
【简答题】Peter felt (感到) very sorry because he forgot (忘记) to say “Happy Birthday” to his uncle yesterday. So he wrote（写） a letter to his uncle : “My dear uncle, I’m very sorry because I forgot your birthday. ...
【单选题】选择或校核联轴器时,应以计算转矩 T ca 为依据而不采用名义转矩 T ,是因为考虑 。
A.
旋转时产生的离心载荷
B.
起动和制动时惯性力和工作中的过载
C.
联轴器的制造误差
D.
联轴器的材料机械性能有偏差
【单选题】Peter felt very guilty for not being able to reunite with his family on Christmas Eve, so be decided to ______.He wanted to work till midnight.
A.
work it over
B.
work it out
C.
work it off
D.
work it up
【单选题】选择或校核联轴器时,应以计算转矩 T ca 为依据而不采用名义转矩 T ,是因为考虑到 。
A.
旋转时产生的离心载荷
B.
联轴器的制造误差
C.
联轴器的材料机械性能有偏差
D.
起动和制动时惯性力和工作中的过载
【简答题】阅读理解. Peter felt (感到) very sorry because he forgot (忘记) to say 'Happy Birthday' to his uncle yesterday. So he wrote a letter to his uncle : 'My dear uncle, I'm very sorry because I forgot your birthda...
【单选题】Peter felt lonely at first, but after a time he got _______alone and even enjoyed it.
A.
used to living
B.
using to live
C.
used to live
D.
to be used to living
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