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【单选题】
广义相对性原理是说物理规律()。
A.
在所有惯性系中都一样
B.
在所有加速系中都一样
C.
在所有不存在万有引力的参考系中都一样
D.
在所有的参考系中都一样
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【单选题】碳素工具钢和合金工具钢用于制造中低速的()刀具
A.
手工
B.
成型
C.
螺纹
D.
高速
【判断题】Yet despite our tendency to focus attention on the actor, there is general agreement among critics and directors that the actor’s role in film should be a subordinate one. ( )
A.
正确
B.
错误
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A.
氢气
B.
石油
C.
天然气
D.
水煤气
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A.
手工
B.
成型
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螺纹
D.
高速
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A.
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B.
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C.
our
D.
ours
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A.
正确
B.
错误
【单选题】碳素工具钢和合金工具钢用于制造中、低速()刀具。
A.
手工
B.
成型
C.
螺纹
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