题型:选择题 ---I have tried very hard to find a solution to the problem, but in vain. ---Why not consult with Frank? You see, .A.great minds think alikeB.two heads are better than oneC.a bird in the hand is worth two in the bush.D.it’s better to think twice before doing something 查看答案
题型:多选题 如图所示,一导热性能良好的金属气缸静放在水平面上,活塞与气缸壁间的摩擦不计。气缸内封闭了一定质量的理想气体。现缓慢地向活塞上倒一定质量的沙土,忽略环境温度的变化,在此过程中[ ]A.气体的内能增大B.气缸内分子平均动能增大C.气缸内气体分子密度增大D.单位时间内撞击气缸壁单位面积上的分子数增多 查看答案