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一、选择题(每题3分,共24分)1.一位中学生站在水平地面上,他对地面的压强最接近于().A.103PaB.104PaC.105PaD.106Pa2.把吹胀的气球压在一根大头针上,稍一用力气球就被刺破,而用同样大小的力把它压在大量的大头针上,气球却安然无
A multiple-choice questions (each question 3 points, a total of 24 points) 1. A secondary school student standing on the ground level, his pressure on the ground closest to (). A.103PaB.104PaC.105PaD.106Pa2. The inflated Balloon pressure on a pin, a little hard to force the balloon was pierced, and with the same size of the force it pressed a large number of pins, the balloon was safely without