问题
单项选择题
在图示xy坐标系下，单元体的最大主应力σ1大致指向：()
A.第一象限，靠近x轴
B.第一象限，靠近y轴
C.第二象限，靠近x轴
D.第二象限，靠近y轴
答案
参考答案：A
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在图示xy坐标系下，单元体的最大主应力σ1大致指向：()
A.第一象限，靠近x轴
B.第一象限，靠近y轴
C.第二象限，靠近x轴
D.第二象限，靠近y轴
参考答案：A
阅读下面短文，掌握其大意，然后从21—40各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上涂黑。 My husband had just bought a new washing machine for me. I decided to use it the 21 day, and I washed a lot of things. Everything worked 22 , but I couldn't find 23 of my husband's socks though I had looked 24 for it. The next morning, I got ready for 25 as usual. When the bell rang, the students came in. I greeted them and told them 26 we were going to do 27 . When I turned 28 to write on the blackboard, the class burst out 29 . They l  aughed and laughed. They laughed so much, in fact, that I was 30 the headmaster would be in to see all this.I asked the class to 31 , but the 32 I talked, the more they laughed. So I thought I had better pay 33 attention to them and continue to write on  the blackboard. When I did this, they laughed even more.Before long, the teacher who had the room next to 34 came to see 35 all the laughter was about. When he came in, he started 36 , too. "Good Heavens ! "I said. "Will 37 please tell me what is so 38 ?" "Oh, God," said the teacher, " you have a  brown 39 stuck to the back of your shirt. "So that's 40 I found my husband's missing sock. "Oh, well," I said to the class, "let's just say you have had an unforgettable lesson on static electricity(静电)."
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y
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