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【单选题】
在机械制图中，形位公差在图样中是用代号标注的，代号标注不便时，允许用（）说明。
A.
线型
B.
字母
C.
数字
D.
文字
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at
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A.
频率较高，可以增大作用的深度
B.
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【单选题】In 300 A.D.Chinese children played with a fan-like toy that span upwards and fell back to earth as______ceased.
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emission
B.
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【简答题】调制中频电的治疗作用?
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