问题
单项选择题
机械密封端面间液膜的存在可减轻（），保证密封效果。
A、磨损
B、振动
C、端面压力
D、轴向力
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
机械密封端面间液膜的存在可减轻（），保证密封效果。
A、磨损
B、振动
C、端面压力
D、轴向力
参考答案：A
完形填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项。 On a cold November afternoon, my mother and I were walking home from a pizza store. We were dressed warmly and equipped with the rented video we had been dying to 36 . I was feeling a little 37 , as I was carrying our shopping，bags of snacks and the 38 .They were so heavy that I decided to 39 some things. So I started to walk towards the garbage can 40 I noticed a poor man walking his bike out of the restaurant in front of us. He _41 a paper bag with his dirty hand. He headed over to another nearby garbage can and started _42 it. I suddenly felt very 43 because I was about to do away with a new drink just 44 it was heavy. I knew this man would take all he could 45 , so I walked up to him and 46 the drink and some snacks to him. The man looked up 47 and took what I gave him. A huge smile spread 48 his face and this caused me to feel indescribable 49 . I felt like I 50 be happier with myself, but then he said, “This is my son’s lucky day!” With that, he 51 me happily and started off on his bike. I even heard him 52 a song as he rode away. I got a warm feeling inside and I knew I had done something good for the man and his family. I now understand what is 53 by the saying “Giving is getting”. Since then, every time I have the 54 to do something nice, the picture of the man’s happiness caused by my small gift appears in my mind. This is the 55 of charity.
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