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一、单项选择题 1.一气缸竖直放置如图1所示,气缸内活塞可无摩擦滑动.活塞质量为M,横截面积为S,大气压强为P_0.当气缸向上匀速运动时,缸内气体压强为:( ) A.P_0. B.Mg/S. C.P_0+(Mg/s). D.P_0-(Mg/s). 2.图2中U形管一端封闭,用水银封入部分空气后竖直向下放置,已知大气压强为P_0,则管内封闭空气的压强是:( ) A.P_0-(h_1-h_2). B.P_0+(h_1-h_2). C.P_0-(h_1+h_2). D.P_0+(h_1+h_2).
First, single-choice questions 1. A cylinder is placed vertically. As shown in Figure 1, the piston in the cylinder can slide without friction. The mass of the piston is M, the cross-sectional area is S, and the atmospheric pressure is P_0. When the cylinder moves in a uniform upward direction, the cylinder The internal gas pressure is: () A.P_0. B.Mg/SCP_0+(Mg/s). D.P_0-(Mg/s). 2. The U-shaped tube in Figure 2 is closed at one end and sealed with mercury. Placed vertically down, the known atmospheric pressure is P_0, then the pressure of the enclosed air inside the tube is: () A.P_0-(h_1-h_2). B.P_0+(h_1-h_2). C.P_0-(h_1+h_2 ). D.P_0+(h_1+h_2).