设备、机具、设施技术哪些不良状态容易导致事故发生？

某老师从星期一到星期五收到的信件数分别为10，6，8，5，6，则该组数据的方差s²=（    ）。

下列行为中，属于主票据行为的是：

A．签发票据

B．背书

C．承兑

D．保证

风险调整折现率法与调整现金流量法一样，均对远期现金流量予以较大的调整，区别仅在前者调整净现值公式的分母，后者调整分子。（）

滤线栅使用原则中，被照体厚度应超过()

A．15cm   

B．12cm

C．10cm   

D．8cm

E．5cm

阅读表达。

     阅读下面的短文, 并根据短文后的要求答题.  ( 请注意问题后的词数要求 )

       If you are a male and you are reading this,congratulations:you are a survivor.  According to statistics,

you are more than twice as likely to die of skin cancer as a woman,and nine times more likely to die of

AIDS.

     There are many reasons for this. Typically,men take more risks than woman and are more likely to

drink and smoke but perhaps more importantly,men don't go to the doctor.

     Gullotta,a professor from a famous medical university,says a healthy man should visit the doctor every

year or two.For those over 45 ,it should be at least once a year.

     Two months ago Gullotta saw a 50-year-old man who had delayed doing anything about his smoker's

cough for a year.

        According to a recent survey,95% of women aged between 15 and early 40s see a doctor once a

year,compared to 70% of men in the same age group.

       " A lot of men think they are absolutely strong," Gullotta says. They only come in when a friend

drops dead on the golf course and they think," Geez,if it could happen to him,________. "

         Then there is the ostrich approach, " Some men are scared of what might be there and would

rather not know, " says Dr. Ross Cartmill.

        " Most men get their cars serviced more regularly than they service their bodies," Cartmill says.  He

believes most diseases that commonly affect men could be addressed by preventive check-ups.  Cartmill

says " regular check-ups for

men would surely place stress on the public purse,but prevention is cheaper in the long run than having

treat the diseases. " Besides,the ultimate cost is far greater:it is called premature death.

1.  What is the best title of the passage?  ( Please answer within 10 words)

   ______________________________________________________________________________

2. Which sentence in the passage is the closest in meaning to the following one?

   In his opinion, medical examinations in advance can help solve some common male diseases.

   _______________________________________________________________________________

3.  Please fill in the blank in the sixth paragraph with proper words or phrases to complete the sentence. ( Please answer within 10 words)

_______________________________________________________________________________

4.  Give three suggestions for men to keep healthy. ( Please answer within 30 words)

①__________

②__________

③__________

5. Translate the underlined sentence in the last paragraph into Chinese.

   ____________________________________________________________________