岩性一般较单一，以中、粗粒结构为主，致密坚硬，孔隙率小，透水

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问题单项选择题

岩性一般较单一，以中、粗粒结构为主，致密坚硬，孔隙率小，透水性弱，抗水性强而常被选为理想的建筑基础的是( )。

A．沉积岩

B．深成岩

C．浅成岩

D．喷出岩

答案

参考答案：B

单项选择题

Which of the following statements best summarizes the main idea of the passage().

A. The British government risks missing its target of halting obesity in children under 11 by 2010.

B. It could be the first generation for decades to die before their parents because of obesity.

C. The British government’s efforts to tackle the problem of obesity are inefficient, confused and under-resourced.

D. The government has made some progress in dealing with the problem of obesity.

单项选择题

冬季砌筑工业炉，耐火泥浆的温度不得低于（）℃。

A.-4

B.0

C.+5

D.+10