以下结论中正确的为( )。
A.应力是内力的平均值 B.应力必小于内力C.应力是内力的集度 D.内力为应力的代数和
参考答案:C
每年3月5日为“学雷锋日”。2012年3月2日,中 * * 办公厅印发《关于深入开展学雷锋活动的意见》,强调指出,要推动学雷锋活动________、________,形成践行雷锋精神、争当先进模范的生动局面,形成我为人人、人人为我的良好氛围。 [ ]
A.时代化、群众化
B.系列化、制度化
C.常态化、机制化
D.公益化、规范化
At the time friends visit us in the evening, they often tell us they are in a hurry and look at their watches. It isn’t that our friends are all very busy; it is just that we haven’t got a television. People think that we are very strange. "But what do you do in the evening", they are always asking. The answer is very simple. Both my wife and I have hobbies. We certainly don’t spend our evenings looking at the walls. My wife enjoys cooking and painting and often attends evening classes in foreign languages. This is quite useful as we often go abroad for our holidays. I collect stamps and I’m always busy with my collection. Both of us enjoy listening to the music and playing chess together.
Sometimes there are power cuts and we have no electricity in the house. This does not worry us and we just light candles and carry on with what we were doing before. Our friends, however, are lost—no television! —So they don’t know what to do. On such evenings our house is very full for they all come to us. They all have a good time. Instead of sitting in silence in front of the television, everybody talks and plays games.
At night when there is no electricity, the couple ().
A.have to look at the walls
B.can do nothing but sit in silence
C.will have many visitors
D.have to go out for candles