单轴应力状态时，平行主应力的截面上（）。A、没有剪应力和直应力B、只有剪应力C、只有 发布时间：2017-09-10 02:31 │ 来源：www.tikuol.com 题型：单项选择题 问题： 单轴应力状态时，平行主应力的截面上（）。A、没有剪应力和直应力B、只有剪应力C、只有直应力D、有剪应力和直应力
题型：单项选择题 任务型阅读。 In a fast changing world, people seldom see a device or equipment that lasts for a long time these days. There are always new inventions, different models, or upgrades cropping up one after the other and as consumers people highly anticipate the faster and better kind than what they already have. Therefore it is quite a surprise that a mini projecto r(投影仪) is still in use today not only in small scale businesses, schools, or homes but in big corporations and institutions as well. Sure it has a few additional features here and there but the main function is the same. A mini projector today has been fitted with top of the line parts and high quality materials to ensure its efficiency and performance can meet the demands of whoever it is for. It is so designed that it can be used indoors or outdoors with the same functions. The mini projector, as the name suggests, is handy and compact and can easily be brought anywhere by just one person. It can support a broader scope of signals now; USB and card readers are now installed to cope with the pieces of equipments that people use today to store data.It can be used at home where it can provide as a form of entertainment or start a conversation during family bonding times. The owner can easily use the mini projector to share with other members the photos and videos of one particular vacation, or just to play a series of beautiful landscapes. Offices also benefit from a mini projector especially during an important meeting or presentation. With at par resolution (标准的分辨率), employees can easily decipher (辨认) the text or data with the use of a mini projector, its bright LED light is sufficient enough to provide a bright and clear image without distortion (变形). Users can now bring this anywhere with them and can be especially useful on a location where the voltage (电压) is unknown. Perhaps one of the more common places where a mini projector is used constantly is in schools. Teachers or professors use this as an aid to a lesson or discussion to provide better visual aids than usual and to even deliver their lecture with the use of a mini projector and minimize the use of a board and writing pen. It is often said that children have a very short attention span but they remember things more when things are presented to them visually. This is the perfect use of a mini projector in classrooms where kids easily forget their lesson for the day. Teachers use this to show the class pictures or illustrations that tie with the topics for students to remember.TitleThe mini projector and its usesTheme(1)_______ many other devices in this fast changing world, mini projectors are still widely used though there are newer and more modern inventions.Extra (2)___·It works efficiently and can meet the specific demands of its(3)_______. ·(4) ______ used indoors or outdoors, the mini project remains the same function. ·Handy and compact, it's easy for a single person to carry wherever he likes. ·It (5)______ a broader scope of signals. What's more, people can use it to store data by (6)____ USB and card readers.The (7)_______ of a mini projector·A mini projector makes family times more interesting, allowing family members to (8)__ themselves. ·With a mini projector, employees have little (9)______ in explaining the text or data at an important meeting or presentation. ·Aided by a mini projector, teachers and professors can present a lesson or discussion visually, which will help students achieve (10)_____ study results. 查看答案
题型：单项选择题 某环评单位对环境保护部的行政处罚有异议，则其可以采取的权利救济途径有( )。A．向环境保护部提出行政复议B．向国务院提起行政复议C．向环境保护部所在地的基层人民法院提起行政诉讼D．向环评单位所在地的中级人民法院提起行政诉讼E．向环境保护部所在地的中级人民法院提起行政诉讼 查看答案
题型：单项选择题 如图所示，某个力F=10 N作用于半径为R=1m的转盘边缘上，力F的大小保持不变，但方向始终与作用点的切线方向保持一致，则转动一周的过程中的这个力F所做的功应为 [ ]A.0B.20πJ C.10 J D.20 J 查看答案
