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【简答题】
表达式 12>=12 and 7<=8 的值是 (True/False)
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举一反三
【单选题】There is no ______ in the bus so we have to wait for another bus.
A.
room
B.
a room
C.
seats
【单选题】电路如图所示。已知U2=20V,稳压管的 =9V,R=300Ω, =300Ω。若不慎将稳压管开路了,电路的输出电压 为 。
A.
9V
B.
12V
C.
24V
D.
28V
【单选题】There is no______on the bus, so we have to wait for another one.
A.
a seat
B.
seats
C.
room
【简答题】Rewrite the following passage, giving the sentences some variety in length and structure I got up a little later than usual on Sunday morning. I washed and had a quick breakfast. Then I started going ...
【单选题】若电路如图示,已知U 2 =20V,测得输出电压为28 V,可能的原因是: ______。
A.
负载电阻开焊
B.
电容开焊和二极管1开焊
C.
二极管1反接
D.
电容开焊
【单选题】There is no ______ in the bus so we have to wait for another bus.
A.
room
B.
a room
C.
rooms
D.
seats
【单选题】若电路如图示,已知U 2 =20V,测得输出电压为9V,可能的原因是: ______。
A.
负载电阻开焊
B.
电容开焊和二极管1开焊
C.
二极管1反接
D.
电容开焊
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