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7辆车跑5趟能运280吨水泥。现在某工地需要水泥320吨，规定在4趟内运完，问需要增加同样型号的车子多少辆( )
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在机床电气控制线路中，用于电动机短路保护的电器是热继电器。（ ）
案例分析题阅读《往事》中的一段文字，回答下列问题。涵道：“姐姐，该你说一说了。”我道，“好的都让你们说尽了——我只希望我们都像海。”杰笑道：“我们不配做女神，也不要‘艳如桃李，冷若冰霜’的。”他们都笑了——我也笑说，“不是说做女神，我希望我们都做个‘海化’的青年。” 为什么姐弟都主张不做女神？
Unlil I took Dr．Offutt’s class in DeMatha High school，I was an underachieving student，but I left that class (1) never to underachieve again．He not only taught me to think，he convinced me． (2) by example as words that it was my moral (3) to do so and to serve others． (4) of US could know how our relationship would (5) over the years．Wmen I came back to DeMatha to teach English，I worked for Dr．Offutt，the department chair．My discussions with him were like graduate seminars in adolescent (6) ．classroom management and school leadership． After several years, I was (7) department chair, and our relationship (8) again. I thought that it might be (9) chairing the department, since all of my (10) English teachers were (11) there, but Dr. Offutt supported me (12) . He knew when to give me advice (13) curriculum, texts and personnel, and when to let me (14) my own course. In 1997, I needed his (15) about leaving DeMatha to become principal at another school. (16) he had asked me to stay at DeMatha, I might have. (17) , he encouraged me to seize the opportunity. Five years ago, I became the principal of DeMatha. (18) , Dr. Offutt was there for me, letting me know that I could (19) him. I’ve learned from him that great teachers have an inexhaustible (20) of lessons to teach.
森林是人类文明的摇篮，是最直接影响人类能否生存下去的生存因子。森林吸收C02的比例，据估计，世界上的森林和植物每年产4000亿吨氧气，森林是造雨者，不但影响降水量，而且减缓山坡上的土壤侵蚀。 这段话支持了这样一个论点，即森林( )。
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