【多选题】
I want to mail this letter to the U.S..___________ ?
①
How often do you hear from Mary
②
How many people are there in your family
③
How much is the postage
【单选题】
I want to mail this letter to the U.S.._________ is the postage, please?
【单选题】
相间短路的阻抗继电器采用0°接线。例如I<sub>J</sub>=I<sub>B</sub>-I<sub>A</sub>时,U<sub>J</sub>=()。
②
U<sub>B</sub>-U<sub>A</sub>
③
U<sub>A</sub>-U<sub>B</sub>
【多选题】
I want to___________ this letter to the U.S.. How much if the postage, please?
【单选题】
音素[i]和[u]的不同主要是由什么决定?
【单选题】
在电压U与电流I采用关联方向时,任意二端元件的功率P=
【判断题】
答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”I had came from a quiet little town and I had never before lived in a big city.