电路如图 1 所示,已知 U 2 =10V , R L =100 Ω, C=220 μ F ,求( 1 )电路正常工作时的输出电压 U O ;( 2 )若测得输出电压 U O =9V ,则电路发生了什么故障?( 3 )若测得输出电压 U O =4.5V ,则电路发生了什么故障?(设二极管为理想二极管)
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【单选题】What do people do on the dragon boat festival?
【单选题】George has spent $600 purchasing and repairing an old fishing boat, which he expects to sell for $900 once the repairs are complete. George discovers that, in addition to the $600 he has already spent...
A.
He should sell the boat as it is now for $400.
B.
He should keep the boat since it would not be rational to spend $1,000 on repairs and then sell the boat for $900.
C.
He should complete the repairs and sell the boat for $900.
D.
It does not matter which action he takes; the outcome is the same either way.
【单选题】Mike has spent $500 purchasing and repairing an old fishing boat, which he expects to sell for $800 once the repairs are complete. Mike discovers that, in addition to the $500 he has already spent, he...
A.
He should sell the boat as it is now for $300.
B.
He should keep the boat since it would not be rational to spend $900 on repairs and then sell the boat for $800.
C.
He should complete the repairs and sell the boat for $800.
D.
It does not matter which action he takes; the outcome is the same either way.