振动电镀设备是利用（）方法来使用电镀工件在振动筛盘内呈螺旋路线翻动的。
A、液压
B、气动
C、电磁
参考答案：C
Of the two cameras, I would prefer ________ one, which is very easy for me to carry.
A．a smaller
B．the smallest
C．a small
D．the smaller
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