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【多选题】
钢按质量分为( )
A.
普通碳素钢
B.
优质碳素钢
C.
高级优质钢
D.
特级碳素钢
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A.
最大加速度增加一倍
B.
振动周期增加一倍
C.
振动频率增加一倍
D.
总能量增加二倍
【单选题】弹簧振子的振幅增加一倍,则
A.
振动周期增加一倍
B.
最大速度增加一倍
C.
总能量增加二倍
D.
最大加速度不变。
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【简答题】听下面一段对话,回答1-3三个小题。 1. Why didn't the woman enjoy herself? [     ] A. She couldn't enter the park. B. She couldn't see the firework clearly. C. She couldn't find her friends. 2. When did the woman get ...
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A.
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B.
春宵一刻值千金,花有清香月有阴
C.
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D.
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