题目内容

图中小球在B点受到的约束是（）

A. 柔体约束
B. 光滑面约束
C. 铰链约束
D. 中间铰链约束

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图示小球D点受到的约束是（）

A 74LS00 chip manufactured by Fairchild Semiconductor consists of four independent NOR gates.

A. 对
B. 错

图示结构中有（）个中间铰链约束。

A signal must be at least 2V for 74LS00chip to recognize logic"1",while a signal must be no higher than 0.8V to recognize logic"0"

A. 对
B. 错