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【多选题】
下图为九管交流发电机控制充电警告灯电路,下面说法正确的是()A.
非充电状态：电源开关接通后，电流从蓄电池 + → 点火开关→充电指示灯→调节器（火线接线柱 D + → D F “磁场”接线柱） →励磁绕组→搭铁→蓄电池负，指示灯熄灭。
B.
充电状态：随发电机转速的提高，三个励磁二极管输出端的电压升高，充电指示灯亮度减弱，当发电机电压达到蓄电池充电电压时，此时指示灯亮。
C.
通过 VD1-VD6 六个二极管整流输出直流电压向蓄电池充电
D.
通过三个励磁二极管 VD7 、 VD8 、 VD9 和三个负极二极管 VD2 、 VD4 、 VD6 六个二极管整流后向励磁电路供电
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【单选题】He() himself on the back for he was the only one to pass the exam.
A.
patted
B.
past
C.
passed
D.
put
【简答题】One can do a mail merger only after he___________.
【简答题】He is the only one of the students who __________ finished the task in time. A) is B) are C) have D) has
【简答题】He is one of the boys who ______ here on time. He is the only one of the boys who ______here on time. A) has come; have come B) have come; has come C) has come; has come ...
【单选题】He is one of the teachers who _____ English but the only one of the teachers who _____ French in our school.
A.
know … knows
B.
knows … know
C.
knows… knows
D.
know … know
【简答题】He ______ (have) little chance of getting the job unless he is the only one to apply for the job.
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