质量不等的两物块A和B其质量分别为mA和mB,置于光滑水平面上,如图所示。当水平

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问题:

质量不等的两物块A和B其质量分别为mA和mB,置于光滑水平面上,如图所示。当水平恒力F作用于左端A上,两物块一起加速运动时,AB间的作用力大小为N1。当水平力F作用于右端B上两物块一起加速运动时,AB间作用力大小为N2,则

[ ]

A.两次物体运动的加速度大小相等

B.N1+N2<F

C.N1+N2=F

D.N1∶N2=mB∶mA

考点:牛顿运动定律的应用
题型:多选题

某桥梁工地的简支板梁架设,由专业架梁分包队伍架设。该分包队伍用2台50t履带吊,以双机抬的吊装方式架设板梁。在架设某跨板梁时,突然一台履带吊倾斜,板梁砸向另一台履带吊驾驶室,将一名吊车驾驶员当场砸死,另有一人受重伤。事故发生后,项目经理立即组织人员抢救伤员,排除险情,防止事故扩大,做好标识,保护了现场,并在事故发生后第一时间内报告企业安全主管部门,内容有:事故发生的时间、地点、伤亡人数和事故发生原因的初步分析。在报告上级以后,项目经理指定技术、安全部门的人员组成调查组,对事故开展调查,企业安全部门和企业负责安全生产的副总经理也赶到现场参加调查,调查中发现下述现象。
(1)项目部审查了分包方的安全施工资格和安全生产保证体系,并作出了合格评价。在分包合同中明确了分包方安全生产责任和义务,提出了安全要求,但查不到监督、检查记录。
(2)项目部编制了板梁架设的专项安全施工方案,方案中明确规定履带吊下要满铺路基箱板,路基箱板的长边要与履带吊行进方向垂直,但两台履带吊下铺设的路基箱板,其长边都几乎与履带吊行进方向平行,而这正是造成此次事故的主要原因之一。
(3)查到了项目部向分包队伍的安全技术交底记录,签字齐全,但查不到分包队伍负责人向全体作业人员的交底记录。
(4)仔细查看安全技术交底记录,没有发现路基箱板铺设方向不正确给作业人员带来的潜在威胁和避难措施的详细内容。
(5)事故造成的直接经济损失达50万元。
通过调查,查清了事故原因和事故责任者,对事故责任者和员工进行了教育,事故责任者受到了处理。

问题


按事故处理的有关规定,还应有哪些人参与调查

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Each year on February 2nd, there is special festival called Groundhog Day (土拨鼠日 )' forecasting event in Punxsutawney, Pennsylvania. When it comes, people from around the world, including 5,000 in the small town today, watch this tongue-twisting(发音饶舌的) small town for a sign from one groundhog that supposedly predicts when that years' spring will arrive.

If it's a cloudy day outside when the groundhog pops from its cave, then spring will arrive early that year. However, if it is sunny outside, the groundhog will supposedly be scared by its own shadow, hiding underground for six more weeks of cold weather.

Of course, Punxsutawney Phil's prediction is no more able to guarantee the extended forecast than your local weatherman. ABC News reports that an analysis by the National Climate Data Center found that Phil's predictions are more often wrong than right.  

Philis is also found to have made some unpleasant predictions. Ever since 1887, he has predicted 99 extended winters and just 16 early springs .Nine of the years' predictions were unavailable, according to ABC.

The holiday began as a German tradition in 18th century and became even more of a cultural phenomenon after the 1993 film Groundhog Day starring Bill Murray.

Punxsutawney Phil has become a celebrity in his own right.  Each year, the fatter animal with long teeth is watched by millions as he emerges from a cave in the town he is named after. Phil has become so beloved by the town that he actually lives in the local library with his “wife" Phyllis.

Taking inspiration from the hard state of Bill Murray’s character in the classic film, Yahoo contributor Owen Rust says Groundhog Day is a good time to reflect on one’s routines.

小题1:The underlined word “pops” means “        ”.

A.escapes

B.appears

C.increases

D.hides小题2:The reason why Phil's predictions aren't pleasing is that_____________.

A.some of the predictions were unavailable

B.Phil wants to do that for fun

C.Phil likes to make unpleasant predictions

D.he has predicted more late springs小题3:How does Punxsutawney Phil become a celebration?

A.By an accident.

B.From people's life improving.

C.By his own attractive force

D.From much money raised by the town.小题4:Which does this passage mainly talk about?

A.The National Climate Data Center

B.A German tradition

C.A tongue-twisting small town

D.Groundhog Day weather forecasting

题型:多选题

试用支出方法核算国内生产总值。

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女性,20岁,感冒后出现心慌气急,拟诊病毒性心肌炎而测定血清病毒特异性IgM抗体。下列哪项结果有助于该诊断()

A.血清效价大于或等于1:40

B.血清效价大于或等于1:80

C.血清效价大于或等于1:20

D.血清效价大于或等于1:160

E.血清效价大于或等于1:320

题型:多选题

Elle tache de trouver de petits travaux; elle _______ n’importe quel travail.

A.approuve 

B.accepte

C. consent

D.refuse

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