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终身寿险具有现金价值，就储蓄成分而言，程度（）两全保险。
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乙建筑公司采用累计实际发生的合同成本占合同预计总成本的比例确定合同完工进度，并采用完工百分比法确认合同收入和合同成本。20X2年1月1日，乙建筑公司签订一项总金额为480万元的建造合同，合同期为3年。20X2年12月31日，乙建筑公司实际发生合同成本100万元，估计至合同完工尚需发生合同成本300万元。20×3年3月2日，客户提出变更部分设计，经双方协商，客户同意追加投资120万元；20X3年年度，乙建筑公司实际发生合同成本150万元，估计至合同完工尚需发生合同成本250万元。假设合同价款能够可靠地收回，乙建筑公司20×3年年度应确认的合同收入金额为（）万元。
某种部件使用2 000台计算机运行1 000小时后，该部件发生失效的计算机共有10台，则该部件千小时可靠度R为(9)。
我国厂区采暖的气温要求为()。
1. Can we predict earthquakes？
2. Can we control earthquakes？
To answer the first question, scientists are looking very closely at the most active fault systems in the country, such as the San Andreas Fault in California. A fault is a break between two sections of the earth's surface. These breaks between sections are the places where earthquakes occur.
Scientists look at the faults for changes which might show that an earthquake was about to occur. But it will probably be many years before we can predict earthquakes accurately and the control of earthquakes is even farther away.
Nevertheless, there have been some interesting developments in the field of controlling earthquakes. The most interesting development concerns the Rocky Mountain Arsenal earthquakes. Here water was pat into a layer of rocks 4,000 metres below the surface of the ground. Shortly after this injection of water, there was a small number of earthquakes. Scientists have decided that the water which was injected into the rocks worked like oil on each other. When the water" oiled" the fault, the fault became slippery and the energy of an earthquake was released.
Scientists are still experimenting at the site of these earthquakes. They have realized that there is a connection between the injection of the water and the earthquake activity. They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists could inject some kind of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes.
Earthquake belts are ______.
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