问题
单项选择题
（）级吊链在酸性介质中使用时，应采取如下措施：吊链的极限工作载荷应不大于原极限工作载荷的50%；吊链使用后，应立即用清水彻底冲洗。其它级别吊链不应在酸性溶液、酸性蒸汽中使用。
A、M（4）
B、S（6）
C、T（8）
D、S（6）；T（8）
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
（）级吊链在酸性介质中使用时，应采取如下措施：吊链的极限工作载荷应不大于原极限工作载荷的50%；吊链使用后，应立即用清水彻底冲洗。其它级别吊链不应在酸性溶液、酸性蒸汽中使用。
A、M（4）
B、S（6）
C、T（8）
D、S（6）；T（8）
参考答案：A
New Energy in the Twenty-first Century Energy from the wind.
All over the world, people use the power of the wind. It is a clean source of energy, and there is lots of it. But if the wind does not blow, there is no wind energy.
Energy from the water
When water moves from a high place to a lower place it has the power to make electricity. In Britain, waterpower produces enough energy to power a town with 40000 people. Waterpower gives energy without pollution, but people have to build dams(大坝) to use this kind of power, and building dams is very expensive.
Energy from the earth
There is heat in the rocks under the earth. Scientists use the heat to make geothermal(地热的) San Francisco gets half of the energy it needs from geothermal power. This kind of energy is cheap, but it is only possible in a few places in the world.
Energy from the sun
Solar panels(镶板) on the roofs of houses and buildings can turn energy from the sun into electricity. These panels can create enough energy to heat the whole house during winter. Solar power is clean and plentiful, but when the weather is bad, it can’t produce power.
阅读上面信息，完成下列表格。
| Advantages | Disadvantages | |
| Wind power | Clean energy. There is a lot of it. | 小题1:__________________________ |
| Waterpower | 小题2:_________________ | It is expensive. |
| Geothermal Power | 小题3:___________________ | It is only possible in a few places in the world. |
| Solar power | Clean and plentiful. | 小题4:___________________________ |
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