未知题型
Scientists can predict earthquakes by means of paying attention to places where pieces of the earth' s surface meet or by ______.
A.
【参考答案】
looking for changes in the earth’s surface
looking for c......
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相关考题
=3MPa，溢流阀的调定压力
=5MPa，试问下列情况下A、B点的压力为多少？（注：缸体固定）
=4MPa时。
变为1MPa时。
