题目内容

霍尔电压与电源提供的电流的大小无关

A. 对
B. 错

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光电编码器的光栏板上有A组与B组两组狭缝，彼此错开1/4节距，两组狭缝相对应的光敏元件所产生的信号A、B彼此相差90°相位，用于辩向。当编码正转时，A信号超前B信号90°；当码盘反转时，B信号超前A信号90°

A. 对
B. 错

增量式光电编码器的测量精度取决于它所能分辨的最小角度，而这与码盘圆周上的狭缝条纹数n有关

A. 对
B. 错

She wondered what over here.

A. has happened
B. was happened
C. had been happened
D. had happened

The fire of London on the right of September, 1666.

A. was broken out
B. had broken out
C. broke out
D. broken out