【单选题】通常规定:电源容量在180千伏安以上,电动机容量在()以下的三相异步电动机就可采用直接起动。
【判断题】乳果糖对糖尿病患者慎用;对有乳酸血症患者禁用;
【判断题】若力的功值只与物体的始末位置有关而与具体路径无关,或者说在力作用下的物体沿任意路径绕行一周时,它们的功值均为零,我们把这种性质的力称为保守力。
【简答题】--Have you _____ the invitation to the party? --Yes, I have. And I've ______ it. A.accepted, received B.received, accepted C.received, received D.accepted, accepted
【单选题】容量在180千伏安以上的电源,7.5千瓦以下的电机都允许()启动。
【单选题】_____ your letter, I would have written back two days ago. [ ]
D.
If I could have received
【多选题】从行动阶段向保持阶段过渡时,哪些“改变过程”在扮演重要角色?
【单选题】I have received an offer from a German university, but I’m still hesitating ______ I should accept it.
【单选题】通常规定:电源容量在180千伏安以上,电动机容量在7.5千瓦以下的三相异步电动机可采用()启动。
【单选题】Choose the correct verbs: 2. The education that I ( has received, have received ) here ( is, are ) really helpful.