in which 中的which指什么?a pump had come into use in which expanding steam raised a piston in a cylinder,and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.
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![in which 中的which指什么?a pump had come into use in which expanding steam raised a piston in a cylinder,and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.](/uploads/image/z/15010347-3-7.jpg?t=in+which+%E4%B8%AD%E7%9A%84which%E6%8C%87%E4%BB%80%E4%B9%88%3Fa+pump+had+come+into+use+in+which+expanding+steam+raised+a+piston+in+a+cylinder%2Cand+atmospheric+pressure+brought+it+down+again+when+the+steam+condensed+inside+the+cylinder+to+form+a+vacuum.)
in which 中的which指什么?a pump had come into use in which expanding steam raised a piston in a cylinder,and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.
in which 中的which指什么?
a pump had come into use in which expanding steam raised a piston in a cylinder,and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.
in which 中的which指什么?a pump had come into use in which expanding steam raised a piston in a cylinder,and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum.
which应该指a pump,
这句话的意思是:有种泵被投入使用,在它内部,膨胀的蒸汽把气缸里的活塞推起来,然后当蒸汽在气缸里凝结成水的时候会形成真空,这样外部的气压会把活塞压回去.