乙炔管道所用的阀门、附件可用钢、可锻铸铁和铜及铜合金制造。 发布时间:2019-04-05 02:48 │ 来源:www.tikuol.com 题型:判断题 问题: 乙炔管道所用的阀门、附件可用钢、可锻铸铁和铜及铜合金制造。
题型:判断题 下列叙述正确的是A.48gO3气体含有6.02×1023个O3分子B.常温常压下,4.6gNO2气体含有1.81×1023个NO2分子C.0.5mol·L-1CuCl2溶液中含有3.01×1023个Cu2+D.标准状况下,33.6LH2O含有9.03×1023个H2O分子 查看答案
题型:判断题 We ______ here at lunch time; we were delayed at the airport, though. [ ]A. could beB. would stayC. must have been D. would have been 查看答案