问题
单项选择题
一个容器内贮有1mol氢气和1mol氦气，若两种气体各自对器壁产生的压强分别为P1和P2，则两者的大小关系是（）。
A．P1＞P2
B．P1＞P2
C．P1=P2
D．不确定
答案
参考答案：C
解析：
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一个容器内贮有1mol氢气和1mol氦气，若两种气体各自对器壁产生的压强分别为P1和P2，则两者的大小关系是（）。
A．P1＞P2
B．P1＞P2
C．P1=P2
D．不确定
参考答案：C
解析：
Brian is my good friend. He has a five-year-old daughter, Lydia. Lydia likes animals very much and always 1 to have a dog. This Sunday is Lydia's birthday. Brian wants to buy 2 a dog. So he goes to the 3 near his home. He says hello to Paul, the owner（主人）of the store. Paul says hello to him, too. Brian says, "This is a clean and 4 pet store." Then he walks around the store. 5 he doesn't see any pets. "Excuse me. 6 are the pets?" he asks. "The pets are right here," says Paul. Then Paul 7 him a catalog（目录簿）. Brian sees 8 pictures of pets in it, like dogs, cats and birds. "You only need to 9 me the pet you like," says Paul. "We can mail（邮寄）it to you." "What if I don't like it?" asks Brian. " 10 mail it back," says Paul. "Oh, sounds interesting," says Brian.
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