单项选择题

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单项选择题
Erosion is left on different surfaces of the stones as the wind directions change, thus making the stones jagged and angular. This kind of stones are called ()
A．A. wind-eroded habitacle
B．B. mushroom rocks
C．C. deflation hollow
D．D. ventifact
单项选择题
在通路状态下，负载电阻变大，端电压将下降。（）
A、正确
B、错误