【简答题】曲线半径大小,对列车运行有什么影响?列车在曲线上运行时,产生曲线附加阻力的原因?
【单选题】— _____ are your trousers? — Black. [ ]
【单选题】This pair of trousers ____ Lucy's. Your trousers ____ on your bed.
【简答题】列车在曲线上运行时,产生曲线附加阻力的原因是什么?曲线半径大小,对列车运行有什么影响?
【单选题】Look! Your trousers are broken. Please go and buy another ____.
【单选题】Look! Your trousers are broken. Please go and buy another ____.
【单选题】Your trousers____ dirty.You must have____ washed.
【单选题】Your trousers ____dirty, you must have _____washed.
【判断题】在交流电电路中,纯电容上电压滞后电流相位90°。
【简答题】列车在曲线上运行时,产生的曲线附加阻力的原因是什么?曲线半径的大小,对列车运行有什么影?