色谱峰的区域宽度用于色谱柱效能的评价，下列参数不属于区域宽度的是（）。 A.ζ B. 发布时间：2017-08-07 17:22 │ 来源：www.tikuol.com 题型：单项选择题 问题： 色谱峰的区域宽度用于色谱柱效能的评价，下列参数不属于区域宽度的是（）。A.ζB.W1/2C.WD.tR
题型：单项选择题 Canadian school buses are called “the safest school buses in the world”．All the school buses，which are in deep yellow，have the same style．School bus drivers have to receive strict training before getting driver’s licenses． When a school bus runs through the city and carries children to a stop, the driver will turn on the red light and then show the sign“Stop”．At this time，all the vehicles(车辆)following the school bus must stop as if they met a red light．After all the children get on or off，the school bus will drive away．Then other vehicles can go on． Many people will think of cartoons as soon as they talk about Japanese school buses．For a long time，cartoon pictures on school buses have already been popular and become models ofJapanese school buses．When children see pink Hello Kitty or blue Doraemon, no one will refuse to go to school any more． On Japanese school buses，there’s always a headman caring for kids．If something happens suddenly，the headman will tell parents about it as soon as possible．小题1:The color of Canadian school buses is ．A．redB．yellowC．pinkD．blue小题2:From the passage, we know that ．A．Canadian school buses must have a headmanB．Canadian school buses should follow other vehiclesC．Japanese school buses may look cuteD．Japanese school bus drivers can get licenses easily小题3:The passage is written mainly to________．A．introduce school buses in Canada and JapanB．suggest schools choosing better school busesC．welcome students to Canada and JapanD．ask students to obey traffic rules 查看答案
题型：单项选择题 如图所示电路中，电源的内阻不可忽略，当开关S断开时，电流表的示数为0.25 A，则当S闭合时，电流表的示数不可能是A．0.22 A B．0.42 A C．0.52 A D．0.58 A 查看答案
