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问题 单项选择题

下面哪一项是白陶的原料：（）

A、低硅高铝低铁、低助溶剂的粘土

B、低硅高铝低铁、高助溶剂的粘土

C、高硅高铝低铁、低助溶剂的粘土

D、高硅高铝低铁、高助溶剂的粘土

答案

参考答案：C

选择题

________Yan yanhong, a kindergarten teacher in Zhejiang Province ________ the boy by holding up him by his ears, his feet about 10 cm off the ground, she ________ free to live her own life now.

A．If; didn’t abuse; would be

B．Had; not abused; would have been

C．If; shouldn’t abuse; should have been

D．Had; not abused; would be
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选择题

一均匀的直角三角形木板ABC，可绕垂直于纸面通过C点的水平轴转动，如图所示．现用一始终沿直角边AB作用于A点的力F，使BC边缓慢地由水平位置转至竖直位置．在此过程中，力F的大小随α角变化的图线是图中的（　　）

A．

B．

C．

D．
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