题目

如图所示，甲、乙分别为同一滑轮组的不同绕法，忽略绳重及一切阻力，用图甲绕法匀速提升重为900N的物体时，机械效率为90%，下列判断正确的是（） A . 拉力的大小为450 N B . 分别用两种方法匀速提升相同重物时，图乙绕法机械效率大 C . 用图乙绕法匀速提升400N重物时，机械效率为80% D . 分别用两种绕法匀速提升相同重物升高相同高度，FB做功少Complete the following sentences as required.【1】My uncle has planned to visit National Museum of China with me this summer.（对划线部分提问）________ ________ your uncle planned to visit with you this summer?【2】During the test, our teacher stopped us from talking with each other.（保持句子意思不変）Our teacher ________ ________us to talk with each other during the test.【3】Did Maggie fly to New York on her own? He wondered.（合并成一句话）He wondered if Maggie________ ________ to New York on her own.【4】The little dog is as heavy as the cat（保持原句意思）The little dog________ as________ as the cat.【5】Betty will sing us some English songs.（改被动语态）Some English songs will ________ ________ to us by Betty.【6】My daughter studies both singing and dancing in the kindergarten.（保持句意基本不变）My daughter studies singing________ ________as dancing in the kindergarten.【7】mean, what, underlined, the, sentence, does, in, English（连词成句）________________________________________________________________________