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One day Mr. Parker said to himself, 'I haven't seen my brother David __21__ a long time, and he's living in a new house now. I'm going to drive there and see him this afternoon.' He took his brother's address, got into his car and started out. He drove for a long time, but he didn't find the house __22__ he stopped and asked somebody to help him. 'Go straight __23__ this road for two miles(英里),' the man said, 'then turn left, and then take the second road on the right.' Mr. Parker went straight along the road and turned left after two miles, but then he got lost again. He drove for __24__ mile, and at last he saw a road on his right and stopped. A woman was coming __25__ him, so he said to her, 'Excuse me, is this the second road on the right?' 21)、 A.so B.for C.towards D.along E.another 22)、 A.so B.for C.towards D.along E.another 23)、 A.so B.for C.towards D.along E.another 24)、 A.so B.for C.towards D.along E.another 25)、 A.so B.for C.towards D.along E.another
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【简答题】翻译:孙子曰:兵者,国之大事,死生之地,存亡之道,不可不察也。
【简答题】孙子曰:兵者,国之大事,死生之地,____,不可不察也。
【单选题】Sepic 斩波电路的特点是( )。
A.
电源电流断续但负载电流连续
B.
电源电流连续但负载电流断续
C.
电源电流和负载电流都断续
D.
电源 电流和负载电流都连续
【判断题】降压斩波电路又称 Boost 斩波电路,该电路的特点是输出电压比输入电压低,而输出电流则高于输入电流。
A.
正确
B.
错误
【单选题】Buck斩波电路的特点是输出电压比输入电压()
A.
B.
【单选题】Zeta斩波电路的特点是( )。
A.
电源电流断续但负载电流连续
B.
电源电流连续但负载电流断续
C.
电源电流和负载电流都断续
D.
电源电流和负载电流都连续
【简答题】听句子,选答语。 (     )1.A. Sorry, I don't know. (     )2.A. Yes, I like coffee very much. (     )3.A. It's thick and cold. (     )4.A. Yes, I could. (     )5.A. Don't say that. B. Congratulations. B. No, th...
【单选题】孙子 曰:兵者,国之大事,死生之地,( ),不可不察也。
A.
诡道也
B.
生死存亡
C.
存亡之道
D.
天地孰得
【判断题】Cuk斩波电路的特点是输入电源电流和输出负载电流都是连续的,且脉动很小,有利于对输入,输出进行滤波。
A.
正确
B.
错误
【单选题】--- Can you tell me how to get to the airport? --- ____________________. A. Certainly , you can take No 3 bus. B. No, I don't know how.
A.
Certainly , you can take No 3 bus.
B.
No, I don't know how.
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