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问题 选择题

一位同学在结冰的冰面上行走，突然发现脚下的冰即将破裂，那么他应采取的措施是（　　）

A．赶快向岸边跑

B．立即改成单脚站立

C．就地伏在冰面上慢慢向岸边爬行

D．站立不动

答案

一位同学在结冰的冰面上行走，突然发现脚下的冰即将破裂，保护冰，不让冰破裂，需要减小压强，在压力一定时，增大受力面积．

A、跑时一个脚着地，压力一定，受力面积减小，压强增大，冰破的更快．不符合题意．

B、单脚着地，压力一定，受力面积减小，压强增大，冰破的更快．不符合题意．

C、就地伏在冰面上慢慢向岸边爬行，压力一定，受力面积增大，压强减小．符合题意．

D、站立不动，压力不变，受力面积不变．压强不变．不符合题意．

故选C．

单项选择题

对斗式提升机的一般故障处理，错误的是（）

A、杓斗压住或卡住时，必须立即停机处理，人站在杓斗正面

B、保险销切断时，应立即停止给料，并停机更换

C、链板断裂时，应立即停机更换，杓斗两侧链板应同时更换

D、防止物料坠落及斗链脱链伤人
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填空题

How many of us would temp for three years while we waited for the perfect job Not many of us, perhaps. But Wentworth Miller, the "Prison Break" star, said he chose to wait even longer time (1) he found the right job.
"Actually I think it might have been three or four years until I was lucky enough to get guest (2) on TV shows," said Miller, 34, who rose to international stardom (3) to "Prison Break" in 2006. That kind of patience and p will was portrayed in "Prison Break". Miller (4) engineering wizard Michael Scofield, who tries everything to break out of a Chicago (5) with his brother. Miller said he was fond of his character, (6) he said "exists in shades of grey".
Miller comes from a (7) of teachers. He said he didn’t seem fated for a career in the arts, (8) his passion for acting. After (9) from Princeton with an English degree, he moved (10) his parents’ request to Los Angeles to look for a stable life. He started (11) in a little company that made television movies. This (12) simply faxing, filing, walking the boss’ dog and going to the store for the boss’ lunch. Every weekend during the summer, Miller (13) go to the office (14) he didn’t have air-conditioning. "I would hang (15) in the conference room and set up camp and rob the company kitchen," recalled Miller.
(16) , Miller realized he still had questions about his choice. He decided to quit. But the boss said he was making a mistake and offered him a well-paid assistant position. "I eventually (17) that if I did the corporate job, it would be great if I was successful, but I would always wonder about the (18) . If I did the acting and was successful, I would never wonder (19) that job," he explained. He quit and temped (20) many people in the entertainment industry.
Now, he’s a hot star and has people coming up to him at film festivals saying, "Weren’t you the one who (21) to stand by the copy machine "
"That was tough, but I’m glad I have that perspective. Because now I’m at a point (22) big shots laugh at all my jokes and I think, You know, I got coffee for people like you for six years’. So I know what’s (23) , because I’ve seen the other side." But what if, when he was offered the corporate job, there had been more money "It was never about the (24) There’s a kind of excitement that comes along with acting. I can’t find it anywhere else. Even if I had to go back to temping, even if this is not the beginning of an amazing career, I would not (25) making that jum
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