题目

质量为m的物体放在倾角为θ的斜面上，它跟斜面间的动摩擦因数为μ在水平恒力F作用下，物体沿斜面匀速向上运动，如图所示．物体受到的摩擦力大小可表示为（） A . μmgsinθ B . μ（mgcosθ+Fsinθ） C . μ（mgcosθ﹣Fsinθ） D . Fcosθ﹣mgsinθ 答案：B,D用所给词的正确形式填空learn by heart, on earth, resign from, give assistance to, congratulate on, in particular, access to ,be close to，in comfort，meet with【1】 With science and technology developing, we now live __________. 【2】 The colleges were founded __________ poor scholars. 【3】 __________ the whole sentences and the phrases that contain the new words so we may know how to use the words. 【4】 Though the Chinese peace-keeping police knew that they would __________ a lot of difficulties, they set themselves to work with a will. 【5】 __________，avalanches (雪崩）happening in Xin-jiang made the situation worse. 【6】 How __________ did you manage to get the car started?【7】 Haier likes design and production __________ its markets. 【8】 All __________ the Chinese audience at the scene of the women's 3,000 meters relay short track speed skating final stood up, cheered and __________ our team's winning. 【9】 Mr. White complained about ill-treatment and decided to __________ his company. 【10】 Now experienced teachers focus more on giving kids __________ the Information Highway.