压缩喷雾器结构如下图所示,A的总容积7.5升,内装药液6.0升,关闭开关K,用打气筒B每次打入1个大气压的空气250立方厘米,要使药液上方空气压强达到4个大气压,应打多少次气?打气后打开K可喷射药液,最多可喷出多少升?(温度不变) 答案:1)18次;2)4.5升 16.5.6升
____________ we will hold the sports meet tomorrow depends on the
weather.
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A. If B. Whether C. What D. That