读英文回答问题 有选项When they think the rocks in a certain place may have oil,a metal tower is built.A machine in the tower cuts a hole down into the ground.At the same time,a steel pipe(钢管) is pushed down to stop the sides from fallin
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读英文回答问题 有选项When they think the rocks in a certain place may have oil,a metal tower is built.A machine in the tower cuts a hole down into the ground.At the same time,a steel pipe(钢管) is pushed down to stop the sides from fallin
读英文回答问题 有选项
When they think the rocks in a certain place may have oil,a metal tower is built.A machine in the tower cuts a hole down into the ground.At the same time,a steel pipe(钢管) is pushed down to stop the sides from falling in and to keep out water.At last if the men are right,usually the oil rushes up the sides with great force(力量) by pressure(压力)of the gas in the top of the rock,and it rushes high into the air.If oil catches a light,there will be a terrible fire.So a kind of cover is fixed on the top of the pipe,and the oil can run out through taps.(活塞)
61.People use a steel pipe because _____.
A.the pipe is strong enough to stand there
B.the pipe can cut a hole down into the ground
C.oil can run through the pipe
D.sides and water can be kept outside the pipe
读英文回答问题 有选项When they think the rocks in a certain place may have oil,a metal tower is built.A machine in the tower cuts a hole down into the ground.At the same time,a steel pipe(钢管) is pushed down to stop the sides from fallin
答案; D
解析:短文中有:At the same time,a steel pipe(钢管) is pushed down to stop the sides from falling in and to keep out water.
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