闪光器是一种很简单的热敏断电器,正常闪光频率为每分钟80~150次。 发布时间:2017-07-26 03:57 │ 来源:www.tikuol.com 题型:判断题 问题: 闪光器是一种很简单的热敏断电器,正常闪光频率为每分钟80~150次。
题型:判断题 阅读下列短文,从所给的四个选项中选出最佳答案. A young man once asked Albert Einstein, the great scientist, 1 the secret of success(成功) is. The scientist told him that the secret of success is 2 work. A few days later the young man asked him the same question again. Einstein was very 3 . He did not say 4 , but wrote 5 words on a piece of paper and handed it 6 the young man. The young man looked at the piece of paper. 7 it was written: A=X+Y+Z. “What does this mean?” asked the young man. “A means success,” explained the old scientist. “X stands for(代表) hard work, Y stands for good methods(方法), and Z…, Z means stopping 8 and getting down to work.”小题1:A.howB.whatC.whichD.why小题2:A.hardB.easyC.goodD.bad小题3:A.pleasedB.happyC.angryD.sorry小题4:A.anythingB.nothingC.somethingD.everything小题5:A.a littleB.littleC.a fewD.few小题6:A.forB.toC.ofD.with小题7:A.OverB.OnC.InD.At小题8:A.talkB.to talkC.talkedD.talking 查看答案
题型:判断题 图中为A,B两种固体物质的溶解度曲线.试根据图回答下列问题:(1)在同一温度下,A和B能否配制质量分数相同的饱和溶液______,理由是______;(2)若把20℃时A物质的饱和溶液,变成保持原溶质的质量分数不变的不饱和溶液,可采用______的方法. 查看答案