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【判断题】
Y-D降压启动的指电动机启动时,把定子绕组联结成Y形,以降低启动电压,限制启动电流。待电动机启动后,再把定子绕组改成D形,使电动机降压运行。( )A.
正确
B.
错误
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【简答题】听力原文：Woman: I tried this pair of shoes and I think I like this colour and style. Please pack them. By the way, I notice that all the goods in your shop are at 20% discount. And this price tag says 20 ...
【简答题】听力原文： I tried this pair of shoes and I think I like this colour and style. Please pack them. By the way, I notice that all the goods in your shop are at 20% discount. And this price tag says ￡20 a pai...
【单选题】关于力和力的投影，下列哪种说法是正确的( )
A.
力是矢量，力的投影是代数量
B.
力是代数量，力的投影是矢量
C.
力和力的投影都是矢量
D.
力和力的投影都是代数量
【简答题】听力原文：I tried this pair of shoes and I think I like this color and style. Please pack them. By the way, I notice that all the goods in your shop are at 20% discount. And this price tag says 20 pounds a...
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