标准分类的A类、B类与C类IP地址采用“网络号—( )”的两级结构。

Sublet.com is not just for sublets (转租，分租) and subleases（转租入，转租出）! If you are searching for a place to live or just need temporary rental housing, you will find the rental you need at Sublet.com. Sublet.com is a full service rental website where landlords(房东), tenants(房客) and roommates come together to rent apartments, houses and rooms.

At sublet.com tenants can search and find every type of rental housing. Sublet.com landlords rent and sublet apartments, houses, townhouses, rooms, hotels, Bed and Breakfasts, mobile homes, vacation rentals and dormitory rooms. Sublet.com rentals and sublets meet every demand: pet friendly rentals and subleases, furnished or unfurnished rentals, short term or long term rentals, roommates, rentals and sublets for tenants with bad credit and obviously rentals for tenants with good credit. At Sublet.com tenants can search for rentals in many different ways. Search rentals by location neighborhood, by zip code(区号), by specific rental needs like doorman, pets, high speed internet, no smokers and more.

If you are a landlord and you have an apartment, house, townhouse or room to rent, post it for free at Sublet.com. Post your apartment or house for a 1 year lease, for a one week rental or even for a 1 day rental. Whatever your rental goals are, sublet.com will help by sending quality rental leads(线索). Sublet.com also offers landlords a complete tenant screening service. At Sublet.com you can conveniently run credit reports, employment reports, criminal background checks to evaluate the quality of a tenant..

Sublet.com does not share personal information. Even email addresses are not accessible to landlords or tenants. Sublet.com does not save credit card information. Sublet.com posts a TRUSTED logo(专用标识) for landlords that have been screened and checked. And tenant reviews of landlords are posted with each listing to express the quality of a rental or a landlord. Since all landlords with tenant complaints are blocked, the length of time a landlord has been posting is shown to indicate the quality of the landlord.

小题1:At Sublet.com, _________.

A．tenants with bad credit can not find their rentals

B．tenants can not find the rentals which provide Bed and Breakfasts

C．landlords can post a flat or a room to rent without paying any money

D．landlords and tenants are informed of each other’s email addresses小题2:This passage is probably_________.

A．an ad for a housing rental website

B．a guide for people to rent houses

C．a direction of making rental deals

D．a collection of rental information小题3:People can do all the following at Sublet.com EXCEPT_________.

A．buy a well-furnished apartment

B．find a place to stay with their pets

C．evaluate the quality of a tenant

D．post their apartment or house for a short term or long term rental小题4:The purpose of the last paragraph is probably to_________.

A．attract more tenants

B．prove that sublet.com is the best

C．refuse people with bad credit

D．convince landlords and tenants of their privacy and security

近年我国暴雨频发，多地相继出现群众被困河心孤岛的险情，为此消防队员常常需要出动参与抢险救灾。如图甲，用滑轮将被困人员悬挂于粗绳下方，一条细绳一端系住被困人员，另一端由位于河道边的救援人员拉动，其原理可以描述为图乙。某时刻被困人员位于河道O处，参与救援人员位于A处，沿OA方向以速度拉细绳，被困人员所受拉力大小为F，此时OA与固定绳OB夹角α，被困人员此时速度为。则

A．

B．

C．拉力瞬时功率

D．拉力瞬时功率

质量管理体每每不的八项原则不包括( )。

A．以顾客为关注焦点

B．组织作用

C．全员参与

D．过程方法

软件生命周期一般可以分为3大的阶段，它们分别是 ______ 。

A．分析、设计和维护

B．定义、开发和测试

C．分析、编码和测试

D．定义、开发和维护