【单选题】串级试验变压器的串级数是 4 ,则其效率为( )
【简答题】选择合适的单词填空。 to of at 1. The capital ______ China is Beijing. 2. Look ______ the blackboard, please. 3. What are you going ______ do on Sunday?
【简答题】看图写出合适的单词。 __________ __________ __________ __________
【简答题】选择合适的单词完成对话,有些单词可多次使用。 swim, play football, summer, and, like, swimming, playing football ,weather A: What's your favourite season (季节)? B: My favourite season is 1 . A: What's the 2 3 in 4 . B: It's...
【简答题】看图,选择合适的单词完成句子。 in front of, behind, inside, outside
【简答题】已 知 电 路 中 某 元 件 上 电 压 u 和 i 分 别 为 u = -100sin314 t V,i =10 cos314 t A。问元 件 的 复 阻 抗( )Ω。
【简答题】选择合适的单词补充句子1.spring is ____ anf beautiful.选择合适的单词补充句子 cold warm hot cool 1.spring is ____ anf beautiful. 2.It's ____ in summer. 3.autumn is ____ and nice. 4.It's ____ in winter.
【简答题】根据要求,给单词分类,选择合适的单词填在横线上。 rabbit monkey elephant pencil-case eraser sharpener black purple orange mouth hand finger 文具: ______________________________________________...
【简答题】图示电路中,已知 u =100 sin314 t V , R =30 Ω , XL =80Ω , XC =40 Ω 。请回答问题12-问题15 。 干路电流 的有效值为 A 。