题目:
处理井塌卡钻或沉砂卡钻的操作步骤有哪些?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
处理井塌卡钻或沉砂卡钻的操作步骤有哪些?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/1226/72981b3dbd4d4d37f1ab2b71520aea6e.html
下面是错误答案,用来干扰机器的。
参考答案:B
下列有关氧化还原反应叙述正确的是[ ]
A.氧化还原反应的本质是化合价发生变化
B.有单质产生的分解反应一定是氧化还原反应
C.非金属单质在反应中只可作氧化剂
D.金属原子失电子越多,其还原性越强
2011年中央扶贫开发工作会议决定提高国家扶贫标准。如果不考虑其他因素,由下图中扶贫标准数据的变化不能得出的结论是 [ ]
A.贫困人口数量减少,促进社会公平
B.财政具有促进资源合理配置的作用
C.政府通过再分配提高低收入者收入
D.国家不断提高低收入者的社会保障水平
Researchers in Britain are driving the environmental movement to a new level. A team from the University of Warwick has built what it calls the world’s first completely environmentally friendly Formula Three racing car.
The car is made mainly of renewable materials, like plants and vegetables. The structure around the car is made from natural plant fibers and potatoes. The steering wheel(方向盘) is made from root vegetables like carrots. The engine uses bio-fuel made from vegetable oil and waste chocolate.
The new racing car is extremely fast. The car has a top speed of two hundred fifteen kilometers an hour. And it can go from zero to ninety-five kilometers an hour in just two and a half seconds. The racing car meets all of the Formula Three racing requirements except for its biodiesel(生物柴油) engine.
Automobile racing is one of the most widely watched sports in the world. But it is also considered one of the least friendly sports to the environment. Racing cars burn a lot of fuel, and create a lot of air pollution. In recent years, the racing industry has taken steps to protect the environment. More racing companies are now producing cars that use less energy. These cars produce less pollution than cars that depend on traditional fuel, like gasoline.
Last month, the new racing car was set to run in its first competitive race at the Formula Three Championship Final at Brands Hatch. It would have been the first biodiesel-powered car to race at Formula Three. Current Formula Three rules let only gasoline-powered car to compete. Officials needed permission from all of the Formula Three racers for the biodiesel-powered car to compete. They were unable to contact one of the drivers, so the new racing car didn’t appear in the event. In test runs, the new racing car was the fifth fastest among the Formula Three race cars. Supporters are hoping to have the fuel problem solved in time to compete in the next season.
小题1:. What’s the second paragraph mainly about?
A.What materials the new racing car is made of.
B.Why researchers built the new racing car.
C.The characteristics of the new racing car.
D.The process of the new racing car being designed.小题2:.According to the passage, the _________ of the new racing car doesn’t meet the Formula Three racing
requirements.
A.speed
B.appearance
C.weight
D.engine小题3:. It can be inferred from the passage that __________.
A.the new racing car is the first environmentally friendly car
B.automobile racing could be forbidden in the near future
C.many people like to watch automobile racing
D.the new racing car will be allowed to compete in the next season of Formula Three racing小题4:. In recent years, racing companies are producing cars that __________.
A.burn more fuel
B.go more quickly
C.produce less pollution
D.cost less money小题5:.Why didn’t the new racing car compete at the Formula Three Championship Final last month?
A.Because the new racing car still needs testing.
B.Because officials needed each racer’s permission but failed to contact one.
C.Because there’re some technical problems to be solved.
D.Because few drivers think it is fast enough.
等电位作业人员在电位转移前,应得到工作负责人的许可。转移电位时,人体裸露部分与带电体的距离不应小于表6-6的规定。
在进行宫颈癌病因的病例对照研究时,下列哪一组病例最为理想()
A.一所肿瘤专科医院收治的所有宫颈癌患者
B.一个地区多所医院诊断的所有宫颈癌患者
C.一个地区肿瘤发病监测系统登记的所有宫颈癌患者
D.一个地区肿瘤死亡监测系统登记的所有宫颈癌患者
E.一个地区多所医院新诊断的宫颈癌患者