罐顶的量油孔用做量油和取样时，每座罐只设一个，通用直径为（）mm。A.250 B.2 发布时间：2019-09-28 04:31 │ 来源：www.tikuol.com 题型：单项选择题 问题： 罐顶的量油孔用做量油和取样时，每座罐只设一个，通用直径为（）mm。A.250B.200C.150D.100
题型：单项选择题 完形填空。 Scientists think that there has been life on Earth for millions of years. However, we haven't found life __1 _ other planets yet. Scientists have discovered many other galaxies in the universe. They are a long way away and their _2_ has travelled for many years to reach us. Scientists have sent _3 of spacecraft to look at other planets in our solar system, and some spacecraft _4_ beyond the solar system. However, no one _5 discovered any life in space yet.( )1. A. in ( )2. A. light ( )3. A. lot ( )4. A. have gone ( )5. A. have B. on B. lights B. a lot B. have been B. has C. to C. sound C. lots C. have been to C. have got D. for D. sounds D. a lots D. have gone to D. has got 查看答案