直流牵引电动机的发电机工指由原动机拖动电机旋转，在电枢绕组中产生感应电势，输出电...

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直流牵引电动机的发电机工指由原动机拖动电机旋转，在电枢绕组中产生感应电势，输出电能，将机械能转变为电能。

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【单选题】—It's 9 o'clock now. I must go. —It's raining outside. Don't leave _____ it stops. [ ]

when

since

while

until

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【简答题】阅读短文,回答问题。 Hello, I'm Mike. I'm in London now. It's cool and rainy here. I can't go outside. My friend Sarah is in Singapore now. It's warm and sunny in Singapore today. She can fly kites with her new...

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【单选题】—It's one o'clock now. I must go. —It's raining outside. Don't leave it stops. [ ]

when

since

while

until

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【单选题】I ____ go now. It's time for class. 我得走了。

have to

must

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【多选题】截取身份证号码中表示出生日期的字符串,正确的是其中变量code表示身份证

code[6,14]

code[-12,-4]

code[-13,-5]

code[14,6]

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【单选题】-It's 10 o'clock. I must go now. -It's raining outside. Don't leave __________ it stops. [ ]

when

since

while

until

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【判断题】10?表示兆,用符号M表示,10-?表示微,用符号μ表示。

正确

错误

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【简答题】--- It's too late. I have to go now.--- Oh. It's raining heavily outside. You'd better wait here ______ it stops.A. since B. until C. while D. though

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【判断题】分子伴侣一类协助细胞内分子组装和蛋白质正确折叠的蛋白质，故极其不保守。

正确

错误

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【判断题】106表示兆,用符号M表示,10-6表示微,用符号μ表示。

正确

错误

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when

since

while