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问题 单项选择题

由发承包双方根据市场行情通过招标投标等方式达成一致、共同认可的成交价格是工程造价的（）。

A．概算造价

B．结算价

C．合同价

D．决算价

答案

参考答案：C

解析：

合同价：

工程招投标阶段，

属于市场价格，根据承包发包双方根据市场行情共同议定和认可的成交价格，

合同价不等于最终决算的实际工程造价。

多项选择题

动脉出血的特征（）。

A.血色鲜红

B.出血如喷泉一样随着动脉搏动由伤口喷出

C.出血急，出血量大，断端压力大不易形成凝血栓而自凝止血

D.危险性很大
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单项选择题

The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface.

What is the primary purpose of this passage

A．To alert people to the dangers posed by the sun.
B．To discuss conditions on earth in the far future.
C．To present a theory about red giant stars.
D．To describe changes that the sun will go through.
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