用于互斥方案评价时，必须考虑时间的可比性，即在相同的计算期下比较净现值的大小的是（）

根据《招标公告发布暂行办法》，规定( )为指定依法必须招标项目的招标公告发布媒体。

A．《中国日报》

B．《中国财经报》

C．《中国经济导报》

D．“中国国际招标网”

E．“中国采购与招标网”

花生的种子是由花的         发育来的，胚是由花的         发育来的。

钢铁工业是国家工业的基础。2007年我国粗钢产量接近5亿吨，居世界前列。湛江的东海岛也将建设千万吨钢铁厂，这将给湛江的经济带来质的飞跃。某校兴趣小组取某种钢样进行试验，请计算：

（1）取钢样（假设只含铁单质和碳单质）粉末100g，在氧气中充分燃烧，得到CO₂气体4.4g，此钢样粉末中碳的质量分数为                 （保留到0.1%）。

（2）分别向四份不同质量的钢样粉末中加入100g稀硫酸溶液，充分反应后，测得的实验数据如下表所示：

计算硫酸溶液中溶质的质量                      g

（3）求在实验3中溶液的溶质质量分数？

It is common to have difficulties sleeping during the day. Humans are naturally wired to sleep best at night and be awake during the day. However, modern work schedules require some people to try to accommodate the unnatural schedule of shift（轮班）work — being awake at night and sleeping during the day.

In order to make this adjustment, you need to pay special attention to your sleep environment and your preparation for sleep. If shift work is a necessary part of your work life, here are some suggestions that may help.

Arrange to sleep uninterrupted in a quiet, dark room. This means you may have to turn off or unplug your phone, hang darkening curtains on the windows or wear a sleep eye mask, and train your family and friends to leave you alone while you sleep.

Fit in a nap（小睡）. When your daytime sleep period is too short, taking a short nap of less than 30 minutes just before work or on a break has been shown to improve alertness and enhance performance.

Develop and follow a sleep routine. It's best if you go to sleep and wake up at the same time every day. Try not to vary this too much on weekends. Your body likes routine.

Take extra care to make healthy choices. You may be tempted to reach for unhealthy foods or nicotine to stay awake or alcohol to try to sleep. But ultimately these choices are more harmful than helpful.

If you have tried all these things and are still having problems getting enough quality sleep during the day, talk to your doctor or a sleep specialist. Sometimes medications（药物治疗）may be helpful and safe. In other cases, there may be an underlying sleep disorder that needs to be addressed.

小题1:The purpose of the text is to     .

A．persuade workers to have a god sleep.

B．advise night workers to keep healthy

C．encourage workers to do day work

D．help night workers to sleep well小题2:What does the author recomusend?

A．A suitable account of alcohol to help sleep.

B．A regular life on weekday’s and weekends.

C．A dark room without phoebes to sleep in.

D．A break for sleeping anytime during the day.小题3:On which condition should a person turn to a sleep specialist for help?

A．If he suffers from a sleep disorder for the first time.

B．If a good sleep environment is greatly needed for him.

C．If he falls to get quality sleep through his own efforts.

D．If he has the problem of bailing to sleep in the daytime.小题4:We can learn from the test that       .

A．night workers need a long time to fall asleep

B．constant breaks at work help to improve performance

C．it is difficult to create a good sleep environment

D．night work requires people to adjust their body clocks

与旧的企业会计准则相比，修订后自2007年1月1日起施行的《企业会计准则——基本准则》关于现金流量表的新增要求，下列说法不正确的是( )。

A．新会计准则同时规范个别现金流量表和合并现金流量表的编制和列报
B．新会计准则增加“公允价值变动损益”科目
C．新会计准则要求披露现金和现金等价物的构成及其在资产负债表中的相应金额
D．新会计准则要求单独列示“处置子公司及其他营业单位产生的现金净额”项目