可靠性预测的作用是（） A.保障产品质量 B.降低成本 C.提高设计效率 D.直观了

男性，65岁。冠心病心绞痛史8年，无高血压史，夜间突发心前区疼痛8小时入院。入院时血压为150/90mmHg，经心电图检查，诊断为急性前壁心肌梗死。

患者出现频发室性期前收缩，有时呈短阵室速，最恰当的处理是（）

A.静脉滴注维拉帕米

B.口服美西律

C.静脉使用利多卡因

D.口服普鲁卡因酰胺

E.静脉滴注硝酸酯类药物

Nuclear energy has always been controversial. But since the tsunami and nuclear disaster in Fukushima(Japan) in 2011, 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. __小题1:__ 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. 小题2:__ So, pro­nuclear 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.

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. _小题3:__ So, while many people may prefer their energy to come from a renewable source, not so many are prepared to pay higher energy bills.

小题4:__ 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 high­profile 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 of people.

The nuclear energy issue is very complex. _小题5:_ 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.

A．And it doesn't look like it'll be resolved anytime soon.

B．The main argument against nuclear energy is that it isn't safe.

C．Nuclear power could only end the world instead of saving it!

D．Many people believe that they will benefit from the unclear energy.E．Unlike fossil fuels, nuclear power doesn't create greenhouse gases.

F．But France and the United States remain loyal supporters of atomic energy.

G．This higher cost of using “green energy” is usually passed onto the consumer.

1．______　2.______　3.______　4.______　5.______

图中，MN和PQ为相距40cm的平行金属导轨，电阻等于0.3的金属棒ab可紧贴平行导轨运动．相距为20cm的水平放置的两平行金属板A和C分别与两平行导轨相连．图中电阻R=0.1，导轨和连线的电阻不计，整个装置处于如图所示的匀强磁场中．当ab以速率v向右匀速运动时，恰能使一带电微粒也以速率v在金属板间作匀速圆周运动，求ab匀速运动的速率v的取值范围(g取10m/)

什么是高电压摄影?适用于哪些胸部病变?

（）所构成的陡坡易产生崩塌。

A.厚层状泥岩

B.玄武岩

C.厚层状泥灰岩

D.厚层状砂岩与泥岩互层