问题
单项选择题
( )是利用矿井主要通风机的风压，借助导风设施把新鲜空气引入掘进工作面。器通风量取决于可利用的风压和风路风阻。
A．引射器通风
B．混合式通风
C．矿井全风压通风
D．抽出式通风
答案
参考答案：C
解析： 矿井全风压通风是利用矿井主要通风机的风压，借助导风设施把新鲜空气引入掘进工作面。器通风量取决于可利用的风压和风路风阻。
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( )是利用矿井主要通风机的风压，借助导风设施把新鲜空气引入掘进工作面。器通风量取决于可利用的风压和风路风阻。
A．引射器通风
B．混合式通风
C．矿井全风压通风
D．抽出式通风
参考答案：C
解析： 矿井全风压通风是利用矿井主要通风机的风压，借助导风设施把新鲜空气引入掘进工作面。器通风量取决于可利用的风压和风路风阻。
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| Food is important. Everyone needs to 1 well if he wants to have a strong body. Our minds also need a kind of food. This kind of food is 2 .We begin to get knowledge even when we are young. Small children are 3 in everything around them. They learn somrthing while they 4 and listening. When they are getting older they begin 5 storybooks, science books...anything they like. When they find 6 , they have to ask questions and try to get the answers. What is the best 7 to get knowledge?If we learn by ourselves, we 8 the most knowledge. If we are 9 getting answers from 10 and don't ask why, we will never learn more or understand better.
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