等速移动定心夹紧机构是依靠定心夹紧元件做等速（）来实现定心夹紧的。
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The consequence of the three neutrality acts of the United States was（）
A. to make the United States gain time to arm itself
B. to actually help the aggressors by making clear that the United States would not intervene
C. to get the United States involved in the war
D. to prevent the United States form being dragged into the war
上海玉佛寺觉群创业基金仅资助拥有上海本市户籍的创业者。
A. 正确
B. 错误
低温钢埋弧焊必须采用小线能量，这样才可以避免热影响区扩大和过热区晶粒粗大，防止焊接接头（）下降。
A. 硬度
B. 强度
C. 低温韧性
D. 刚度
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