根据岩心编号的要求，两端具有磨光面的砂岩岩心，长度要达到20cm才编一个号。 发布时间：2017-07-24 14:59 │ 来源：www.tikuol.com 题型：判断题 问题： 根据岩心编号的要求，两端具有磨光面的砂岩岩心，长度要达到20cm才编一个号。
题型：判断题 能源是现代社会进步的主要因素．请回答下列问题：（1）天然气是一种主要能源，写出其燃烧的化学方程式______．（2）煤资源是有限的，生活中常将块状的煤粉碎后再使其燃烧的原因是______．但煤的直接燃烧会对环境造成的主要危害是______．（3）开发和利用新的能源有着重要的意义．乙醇汽油这种新能源属于______（填“混合物”或“纯净物”）．氢气也是一种新能源，氢气作为能源的优点______（写出两条）． 查看答案
题型：判断题 完形填空。 It is about seven o’clock 1 a Monday morning,and it 2 raining.A cold wind is blowing,and the 3 is grey(灰色的).Men and 4 are going to work.Children are going to 5 .Some are 6 foot.Some are on bikes.The others arewaiting 7 buses in the rain.The streets are 8 of cars,buses,bikes and people.They are all moving 9 the streets.Some people are wearing raincoats(雨衣),many 10 umbrellas(雨伞).Rain is falling on the roofs(屋顶),the streets and the umbrellas.( )1. A. in ( )2. A. am ( )3. A. sky ( )4. A. woman ( )5. A. work ( )6. A. by ( )7. A. of ( )8. A. full ( )9. A. along( )10. A. are takingB. on B. are B. air B. women B. school B. in B. for B. a lot B. in B. are holdingC. at C. is C. cloud C. girls C. farm C. on C. on C. lots C. on C. are puttingD. of D. be D. wind D. boys D. home D. with D. to D. much D. at D. are bringing 查看答案