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【单选题】
常用作电影胶片的拉片机构的间歇运动机构是：【 】
A.
棘轮机构
B.
槽轮机构
C.
不完全齿轮机构
D.
凸轮机构
参考答案：
参考解析：
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【单选题】Music to My Ears When other shad doubts, my father believed in me. As a boy growing up in Shenyang, China, I practiced the piano six hours a day. I loved the instrument. My mother, Xiulan Zhou, taught...
A.
The whole family moved to Beijing.
B.
He and his father went to Beijing to learn piano.
C.
His mother got iii.
D.
His family objected to his learning in Beijing.