桥式整流电路，输入交流电压的有效值为10V，则输出直流电压约为（ ）。

中国古代记载的白天都能看见的“天关客星”，就是什么天象？A、红巨星闪耀B、白矮星坍塌C、流星划过夜空D、超新星...

单项选择题中国古代记载的白天都能看见的“天关客星”，就是什么天象？

You’re going to make a presentation about people’s incr...

单项选择题You’re going to make a presentation about people’s increasing reliance on mobile phone. Which of the following is NOT appropriate to be used to grab audience’s attention in the opening of a presentation?
A、You open with a quotation: "If television is a babysitter, the Internet is a drunk librarian who won’t shut up".
B、You ask audience to imagine what if they live without mobile phone for two days.
C、You display a picture in which all the people are playing with mobile phones on a subway car.
D、You open with a question: “Could you tell me how often you update your We-chat Moments?”

恰如其分和 是人们判断沟通能力的基本尺度。A、顺其自然B、出口成章C、沟通效益D、表达流利

单项选择题恰如其分和 是人们判断沟通能力的基本尺度。