在图示的三相四线制低压供电系统中，如果电动机M1采用保护接中线，电动机M2采用保护接

网络团购，是指一定数量的消费者通过互联网渠道组织成团，以折扣购买同一种商品。根据上述定义，下列属于网络团购的是（）。

A．甲公司采购员网购了各种小礼品，作为公司联欢会抽奖的奖品

B．陈某从网站上以五折的价格购得20张月饼券，又以七折的价格卖给20位同事

C．“糯米网”推出“30床以上打2.3折”的羊毛被网购活动，陆某和同事一起上网购买

D．张某组织正在装修的5位邻居一起到某地购买家具

Researchers have known that secondhand smoke can be just as dangerous for nonsmokers as smoking is for smokers, but now there’s fresh evidence quantifying just how hazardous the after-burn from cigarettes can be, and how quickly it affects your body. Scientists at the Oregon Department of Health documented for the first time an hourly buildup of a cancer-causing compound from cigarette smoke in the blood of nonsmokers working in bars and restaurants in the state.

Reporting in the American Journal of Public Health, the researchers found that waiters and bartenders working a typical night shift gradually accumulated higher levels of NNK, a carcinogen in cigarette smoke, at the rate of 6 % each hour they worked. NNK is known to be involved in inducing lung cancer in both lab rats and smokers.

"We were somewhat surprised by the immediacy of the effect and the fact that we could measure the average hourly increase," says Michael Stark, the lead author of the study and a principal investigator at the Mulmomah County Health Department in Oregon.

The authors are confident that the increases in NNK in the workers they tested most likely came from their exposure to smoke -- the study included a control group of similar subjects in restaurants where no smoking was allowed. "There is experimental evidence from studies where you put nonsmokers in a room, blow smoke into the room and measure their artery function, that you see the platelets get sticky, which can cause clots and lead to a heart attack, and the ability of the arteries to dilate decreases very rapidly," says Dr. Matthew McKenna, director of the office on smoking and public health for the Centers for Disease Control.

All of which could mean more time loitering outside buildings and in alleyways for smokers intent on grabbing a puff. Thirteen states now prohibit smoking in restaurants altogether (most of these include bars as well), and while 11 states still put no restrictions on lighting up, individual cities within those states -- such as Austin in Texas, for example -- have passed legislation banning smoking in eating establishments and other public areas.

It’s just getting harder to refute the scientific evidence; in a study done in Scotland several months after that nation instituted a ban on smoking in public places, researchers found that following the ban, bar patrons showed per lung capacity and reduced levels of inflammation (a red flag for a number of chronic diseases, including heart disease and asthma). "We made it pretty clear that the science on this is pretty irrefutable," says McKenna. And if smokers have fewer places to smoke, that message may finally get heard.

As is used in Paragraph 4, the phrase "a control group" refers to （）.

A．people working at the Oregon Department of Health

B．people investigating at the Mulmomah County Health Department in Oregon

C．people serving as a standard of comparison for checking test results

D．people involved in passing legislation banning smoking in eating establishments

应用环孢素的患者应监测以下哪些指标()

A．肝功能变化

B．肾功能有无损害

C．血钠变化

D．血钾的变化

E．肺功能变化

长丝生产污水处理后的PH值（）。

A.≤5

B.≥9

C.≥12

D.6≤PH≤9

仲裁庭对当事人申请仲裁的争议做出裁决，自裁决书作出之日起发生法律效力。 ( )