题目

如图所示,两段粗细均匀内壁光滑的玻璃管竖直放置,开口向上,下端一段粗,横截面积为S=7.5×10-3m2,上端横截面为S=2.5×10-3m2。粗管中静止着一段长度为h1=5cm的水银柱,水银柱上表面到细管下端口的距离为h2=20cm,水银柱下端封闭了一段长度为L=30m的理想气体。此时管中气体温度为t=27℃,当地大气压强p0为75cmHg,水银密度为p=13.6×103kg/m3,整个气缸均是绝热的。水银柱的下端粘有一薄层轻质绝热材料。在气体中有一段金属丝(图中未画出)和外界组成电--- He hasn’t watched the movie “ So Young”,  has he?             --- ______. He told me it was very moving and interesting, he’d like to watch it again. A. Yes, he has                       B. Yes, he hasn’t                  C. No, he hasn’t          D. No, he has
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