饭店的程控交换机有()的功能。A、语音音箱 B、语音报箱 C、语音邮箱 D、语音信箱 发布时间:2017-07-18 03:01 │ 来源:www.tikuol.com 题型:单项选择题 问题: 饭店的程控交换机有()的功能。A、语音音箱B、语音报箱C、语音邮箱D、语音信箱
题型:单项选择题 In our class, when the bell rang and the teacher closed his book, it was a____ for everyone to stand up. [ ]A. signal B. chance C. mark D. measure 查看答案
题型:单项选择题 在一定条件下,将钠与氧气反应的生成物2.8 g溶于水,所得溶液恰好能被80 mL浓度为1.0 mol/L的HCl溶液中和,则生成物的成分是[ ]A.Na2O B.Na2O2C.Na2O和Na2O2 D.Na2O2和NaO2 查看答案