测定绝缘油闪点前应做哪些准备工作？
参考答案：
准备工作如下：
（1）试油的水分大于0.05%时必须脱水。往试油中加入新煅烧并经冷却的食盐、硫酸钠或氯化钙进行脱水。脱水时，估计闪点低于100℃时不必加热；估计闪点高于100℃时，可加热到50～80℃，脱水后，取试油的上层澄清部分供试验用。（2）用溶剂汽油或石油醚洗涤油杯，并用空气吹干。
（3）调整点火器的火焰接近球形，使其直径为3～4毫米。
（4）闪点测定器要放在避风和较暗的地方，围上防护屏，以便观察闪火情况。
（5）记录试验时的大气压力，以备修正闪点值。
采访中有5处需要添加信息。请从以下选项中（A, B, C, D, E和F）中选出符合各段意思的选项。选项中有一项是多余的。
小题1:_________________________________ There were the older jazz musicians who hung around our house when I was young．I saw how much they practiced, how serious they were about their art．I knew then I had to work just as hard if I wanted to succeed．Of course, my father inspired me a lot, and many teachers took the time to nurture my talent and the talents of other students in our school． 小题2:_____________________________ Yes．We’ve done such a poor job with music education because, as a society, we haven’t maintained the kind of education that a true artist and musician needs．Young people haven’t been able to equate romance and talent with music．For instance, most of the people who make it in the music industry today have to look good．How they sound is secondary．Sarah Vaughan, Bessie Smith, Ella Fitzgerald — those big, romantic queens of jazz music wouldn’t make it in today’s music industry, and that’s a shame．We need to teach young people about the alternatives． 小题3:______________________________ Around the world people make music that, if you listen carefully to it, sounds a little like the cadence of their language．I’d call it folk music．When I’m away from home, I make a point of listening to regional folk music, not what’s on the radio． 小题4:_______________________________ The same music is on the radio all over the world, and the American sound is overwhelming．Even the pop music that’s produced and created in foreign countries has that American beat, which underscore funk．As a musician, I’m not interested in hearing recycled versions of the same genre over and over．Any music that doesn’t have a development section just isn’t interesting to me． 小题5:_________________________________ The music press has so much to introduce these days, and jazz is just a small fraction of it．Because some people are intimidated by jazz, they don’t cover it unless it’s a big name．New jazz musicians don’t get much of break．A lot of editors don’t say anything about jazz these days unless it’s Marsalis．That’s a shame．What VH1 is doing with their Save the Music campaign is phenomenal．They’re getting all these instruments out to needy kids．It’s the kind of thing all networks should be doing． |