单项选择题

A、正确
B、错误

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单项选择题

下图电路中二极管导通时压降为 0.7V。若A端电压为UA= 3V，B端电压为U B= 3V，则 Y的输出电源为( )。

A、0.7V
B、3.7V
C、2.3V
D、5V

单项选择题

With respect to the design of warehouses, one suggestion for energy savings is to make sure that dock doors are not placed on the ____ of a building.
A、east
B、south
C、west
D、north