皮皮学，免费搜题
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搜题
【单选题】
在某放大电路中,当负载R L =1KΩ时,输出电压为1V,负载电阻断开时,输出电压上升到1.1V,则该放大电路的输出电阻R 0 为( )。A.
100 Ω
B.
150 Ω
C.
200 Ω
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皮皮学刷刷变学霸
举一反三
【单选题】----You didn’t wait for Mr. Smith last night, did you? ---- Yes, but we _______. He didn’t return home at all.
A.
needn’t have
B.
should have
C.
didn’t need to
D.
don’t have to
【单选题】—You didn't wait for Mr. Smith last night, did you? —Yes, but we ________. He didn't return home at all.
A.
don't have to
B.
needn't have
C.
didn't need to
D.
should have
【多选题】在电商平台数据库中的商品表设计时，以下完整性约束设置合理（）
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