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【单选题】
试卷:(卷一) 故障范围( 2 分) ()A.
振荡电路;
B.
显示电路;
C.
放大电路;
D.
电源电路。 故障点 ( 2 分) () A . D 6 的阳极未接 +V CC ; B . D 7 的阴极未接 -V CC ; C . R 11 和 R P 2 连接处开路; D . C 8 和 R P 2 连接处开路; E . R 8 和 C 7 连接处开路; F . NE555 的 8 脚未接 VCC ; G . R1和 R3 连接处开路; H . D 3的阳极和 R9 连接处开路; I . R 6和 Q1 的发射极连接处开路; J . R 7和 Q2 的发射极连接处开路。 故障排除 ( 1 分) 结合实际电路考核 ( ) A . D6的阳极接 +VCC ; B . D7的阴极接 -VCC ; C . R11和 R p2开路处进行连接; D . C8和 R p2开路处进行连接; E . R8 和 C7 开路处进行连接; F . NE555 的 8 脚接 VCC ; G . R1和 R3 开路处进行连接; H . D 3的阳极和 R9 开路处进行连接; I . R 6和 Q1 的发射极开路处进行连接; J . R 7和 Q2 的发射极开路处进行连接。
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举一反三
【单选题】— May I swim in the river, Mum? — . [ ]
A.
No, you aren't
B.
Why do you ask me
C.
No, you can't
D.
I can't go with you
【单选题】—Bad luck. My computer doesn’t work. —Why not turn to John? No one can match him in our class when it __________repairing computers.
A.
comes to
B.
leads to
C.
contributes to
D.
attends to
【单选题】听力原文：Why can't the man ask John to call him back? (15)
A.
Because he hasn't a phone.
B.
Because he's leaving the city right now.
C.
Because he's calling from a friend's.
D.
Because his wife is terribly sick.
【单选题】Why can't John go on the boat trip?(T4)
A.
He has booked theatre tickets.
B.
He's scared of the water.
C.
He doesn't feel well.
D.
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