某杠杆匀速提起重物,动力等于重力的四分之三,这个杠杆动力臂与阻力臂之比是____

题型:填空题

问题:

某杠杆匀速提起重物,动力等于重力的四分之三,这个杠杆动力臂与阻力臂之比是_____         

考点:杠杆的平衡条件
题型:填空题

阅读短文,用所给动词的适当形式填空。

     Some people believe that schools will no longer be necessary in the near future. They said that because of

the Internet and other new technology, there is no longer any need for school buildings, classes or teachers.

Perhaps this will be true one day, but if the world has no schools, I can't imagine (想象) how our society will

be. In fact, we should learn how to use new technology to make schools better. We should invent a new kind

of school that is linked to libraries, museums, science centers, labs and even companies. Technological

companies should create (创造) learning programs for schools. Scientists or professors could give talks

through the Internet. TV networks and local stations could develop programs about things students are actually

studying in school. Labs could set up websites to show new technology so students could see it on the Internet.

阅读短文用动词的适当形式填空。

     Some people believe that schools 1_____ (be) necessary in the future. Perhaps this will be true one day,

but if the world 2_____ (have) no schools, I can't imagine (想象) how our society will be. In fact, we should

learn how 3_____ (use) new technology to make schools better. We should 4_____ (invent) a new kind of

school. Websites should 5_____ (set) up to show new technology so students could see it on the Internet.

题型:填空题

当钢筋的混凝土保护层厚度不够时,会造成钢筋受拉时在钢筋附近的()破坏。

A.钢筋断裂 

B.混凝土开裂 

C.钢筋与混凝土间滑动 

D.混凝土剪切

题型:填空题

关于腹外疝的叙述不正确的是

A.是腹内脏器通过腹壁先天性或后天性缺损或薄弱区向体表突出,形成一肿块
B.病因有腹壁强度减弱或腹内压增加
C.按疝的内容物能否回纳分可复性疝、难复性疝
D.嵌顿性疝是指疝内容物突然不能回纳,发生疼痛等系列症状
E.绞窄性疝是指疝内容物发生扭转,发生一系列症状

题型:填空题

阳损及阴,阴损及阳,说明明阳之间的关系是()

A.阴阳对立制约

B.阴阳互根互用

C.阴阳互相转化

D.阴阳消长平衡

E.以上都不是

题型:填空题

某办公楼工程,建筑面积18500m2,现浇钢筋混凝土框架结构,筏板基础。该工程位于市中心,场地狭小,开挖土方需外运至指定地点。建设单位通过公开招标方式选定了施工总承包单位和监理单位,并按规定签订了施工总承包合同和监理委托合同,施工总承包单位进场后按合同要求提交了总进度计划,如下图所示(时间单位:月),并经过监理工程师审查和确认。

合同履行过程中,发生了下列事件:

事件1:施工总承包单位依据基础形式、工程规模、现场和机具设备条件及土方机械的特点,选择了挖土机、推土机、自卸汽车等土方施工机械,编制了土方施工方案。

事件2:基础工程施工完成后,在施工总承包单位自检合格、总监理工程师签署“质量控制资料符合要求”的审查意见基础上,施工总承包单位项目经理组织施工单位质量部门负责人、监理工程师进行了分部工程验收。

事件3:当施工进行到第5个月时,因建设单位设计变更导致工作B延期2个月,造成施工总承包单位施工机械停工损失费13000元和施工机械操作人员窝工费2000元,施工总承包单位提出1项工期索赔和2项费用索赔。

事件1中,施工总承包单位选择土方施工机械的依据还应有哪些?

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