依据增值税的有关规定，下列说法中正确的有( )。 A．银行销售金银的业务，应当征收

为测定空气中氧气所占的体积分数，某同学设计了如图实验，在一个耐热活塞的底部放一小块（足量）白磷，然后迅速将活塞下压，可以观察到的现象为_________；冷却至原来温度时，慢慢松开手，活塞最终将回到刻度________处，试回答白磷燃烧的原因_________；由此实验可以得出的结论是_________。

阅读理解。

     Nuclear energy has always been controversial. But since the tsunami and nuclear disaster in

Fukushima (Japan) last year the issue is back in the headlines. And the world is divided- some countries

are planning more nuclear plants, while others have promised to shut theirs down.

     After Fukushima, Germany decided to switch off all its nuclear plants by 2022. Switzerland and Italy

are also phasing out nuclear power. But France and the United States remain staunch supporters of

atomic energy. In fact, almost 80% of France's electricity comes from nuclear power, the highest

percentage in the world. And in the US, the Obama administration said it "continues to support the

expansion of nuclear power, despite the crisis in Japan."

     Nuclear supporters claim nuclear power can help the environment. Unlike fossil fuels, nuclear power

doesn't create greenhouse gases. So, pro-nuclear countries argue that nuclear power allows them to

generate energy without contributing to climate change. Britain's chief scientific adviser (John Beddington)

supports this view. He recently said that the world doesn't have the luxury of ignoring nuclear energy.

     Nuclear power is also relatively cheap. Renewable energy sources such as solar, hydro and wind

power may be clean, but they're expensive; and right now, they require a lot of investment. This higher

cost of using "green energy" is usually passed onto the consumer. So, while many people may prefer their

energy to come from a renewable source, not so many are prepared to pay higher energy bills. This is of

particular concern while the world economy is in such bad shape.

     The main argument against nuclear energy is that it isn't safe. For a start, nuclear waste is very difficult

to dispose of, and remains toxic to humans for thousands of years. And even before Fukushima, there

were several high-profile nuclear disasters. The most famous is probably the 1986 Chernobyl disaster, in

the Ukraine. The radiation from the meltdown spread all over Europe, affecting thousands.

     The nuclear energy issue is very complex. And it doesn't look like it'll be resolved anytime soon. As a

Japanese commentator recently said, "it's been a bad year for the 'nuclear village', but I don't think they're down and out yet." The battle continues.

1. Which of the following may NOT be the advantage of nuclear energy over other energy sources? 

A. Nuclear energy doesn't produce any greenhouse gases.

B. Nuclear energy can help prevent the climate damage.

C. Nuclear energy is more environmental-friendly than other green energy sources.

D. Nuclear energy can save the consumers some money, compared to other renewable energies.

2. What does the underlined word "this" refer to in paragraph 4? 

A. The fact that many people prefer to use the green energy sources while unwilling to pay higher bill.

B. The cost of using renewable sources

C. The fact that the nuclear power is cheaper.

D. The investment of renewable energy sources

3. We can learn from the last paragraph that _______.

A. the Japanese commentator is positive about the future of nuclear energy

B. the nuclear energy issue will be soon settled

C. a battle will break out in the future

D. Japan is considering to build a nuclear village in the future

4. What is the author's purpose of writing the passage? 

A. To highlight the danger of using nuclear energy.

B. To introduce some serious nuclear disasters.

C. To show the argument between nuclear supporters and protesters.

D. To give some advice on how to use nuclear energy safely.

跑窖法工艺，又称（）。

A.原窖分层堆糟法

B.跑窖分层蒸馏法工艺

C.混烧老五甑法工艺

为降低损耗，提高整流效率，主电路电气连接采取的措施有？

描写燃烧室尺寸大小的参数是燃烧室的（）.

A.直径

B.长短

C.容积

D.容热强度