对于插入深度500mm的真空炉，渣层厚度一般不超过150mm。最大不能超过300mm

下列可以判定为重大火灾隐患的有（）。

A．未按规定设置消防车道或消防车道被堵塞、占用 

B．地下车站的站厅乘客疏散区、站台及疏散通道内设置商业经营活动场所 

C．防火门、防火卷帘等防火分隔设施损坏的数量超过该防火分区防火分隔设施数量的25％ 

D．商店营业厅内的疏散距离超过规定距离的50％ 

E．人员密集场所的疏散走道、楼梯间、疏散门或安全出口设置栅栏、卷帘门

蒲黄具有的功效是（）

A.止血，化瘀，利尿

B.止血，温胃，行气

C.止血，敛肺，下气

D.止血，敛肺，止咳

E.止泻，活血，定痛

Why do men die earlier than women? The latest research makes it known that the reason could be that men’s hearts go into rapid decline（下降） when they reach middle age.

The largest study of the effects of ageing on the heart has found that women’s longevity may be linked to the fact that their hearts do not lose their pumping power with age.

“We have found that the power of the male heart falls by 20-25 percent between 18 and 70 years of age,” said the head of the study, David Goldspink of Liverpool John Moores University in the UK.

“Within the heart there are millions of cells that enable it to beat. Between the age of 20 and 70, one-third of those cells die and are not replaced in men,” said Goldspink. “This is part of the ageing process.”

What surprises scientists is that the female heart sees very little loss of these cells. A healthy 70-year-old woman’s heart could perform almost as well as a 20-year-old one’s. “This gender（ 性别） difference might just explain why women live longer than men,” said Goldspink. They studied more than 250 healthy men and women between the ages of 18 and 80, focusing on healthy persons to remove the confusing influence of disease. “The team has yet to find why ageing takes a greater loss on the male heart,” said Goldspink.

The good news is that men can improve the health of their heart with regular exercise. Goldspink stressed that women also need regular exercise to prevent their leg muscles becoming smaller and weaker as they age.

小题1:The underlined word “longevity” in the second paragraph probably refers to “________”.

A．health

B．ageing

C．long life

D．effect小题2:The text mainly talks about ________.

A．men’s heart cells

B．women’s ageing process

C．the gender difference

D．hearts and long life小题3:According to the text, the UK scientists have known that ________.

A．women have more cells than men when they are born

B．women can replace the cells that enable the heart to beat

C．the female heart loses few of the cells with age

D．women never lose their pumping power with age小题4:If you want to live longer, you should ________.

A．exercise regularly to keep your heart healthy

B．find out the reason for ageing

C．enable your heart to beat much faster

D．prevent your cells from being lost小题5:We can know from the passage that ________.

A．the reason why ageing takes a greater loss on the male heart has been found out

B．scientists are on the way to finding out why the male heart loses more of the cells

C．the team has done something to prevent the male from suffering the greater loss

D．women over 70 could lose more heart cells than those at the age of 20

最适合于建立通讯地址簿并具有查询功能的软件是（）。

A.CAD应用

B.数据库软件

C.文字处理软件

D.电子表格软件

井喷事故分（）级。

A、3

B、2

C、4

D、5