题目

I was in a strange city I didn’t know at all， and what’s more， I could not speak a word of the language. On my second day I got on the first bus that passed， rode on it for several stops， then got off and walked on. The first two hours passed pleasantly enough， then I decided to turn back to my hotel for lunch. After walking about for some time， I decided I had better ask the way. The trouble was that the only word I knew of the language was the name of the street in which I lived， and even that I pronounced badly. I stopped to ask a newspaper-seller. He handed me a pap20．如图为医生在为病人做拔罐治疗．拔罐治疗的原理是大气压；己知人体皮肤的表面积约1.5m2．那么，在1个标准大气压下1.5m2的面积上受到的大气压力为1.5×105 N． （一个标准大气压p=1.0×105Pa）