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【单选题】
三相异步电动机外壳带电的原因是()。A.
绕组断路
B.
一相绕组接反
C.
绕组接地
D.
绕组匝间短路
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反馈参考答案：
举一反三
【判断题】Gemology and Gemstone Instruction Gemology is the study of gemstones, which includes gem properties, locations and origins. Gemology is often studied by people in the jewelry business, including busin...
A.
正确
B.
错误
【简答题】Gemology and Gemstone Instruction Gemology is the study of gemstones, which includes gem properties, locations and origins. Gemology is often studied by people in the jewelry business, including busin...
【判断题】Gemology and Gemstone Instruction Gemology is the study of gemstones, which includes gem properties, locations and origins. Gemology is often studied by people in the jewelry business, including busin...
A.
正确
B.
错误
【简答题】Translate the following sentences into Chinese or English. 1. Gemology is often studied by people in the jewelry business, including business owners, buyers, designers and appraisers.
【简答题】()被称之为世界石油宝库
【判断题】Gemology and Gemstone Instruction Gemology is the study of gemstones, which includes gem properties, locations and origins. Gemology is often studied by people in the jewelry business, including busin...
A.
正确
B.
错误
【判断题】Gemology and Gemstone Instruction Gemology is the study of gemstones, which includes gem properties, locations and origins. Gemology is often studied by people in the jewelry business, including busin...
A.
正确
B.
错误
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