选择取发器械时什么因素对提取率最重要（）。A、价格 B、同心度 C、旋转方向 D、重

Jet lag is back on the agenda for business travelers, especially as long-haul international traffic picks up again.

There is endless advice online about jet lag. Drugs are frequently mentioned, and a recent favorite is Nuvigil, used to treat excessive sleepiness. Nuvigil’s manufacturer, Cephablon, has so far not succeeded in obtaining government approval for its plan to market the drug as a remedy forjet lag.

But the approach I hear most often from long-haul travelers involves diet and preparation. " Why would you take a pill that your body then has to shake off " said Lynne Waller Scanlon, the author, with Charles F. Ehret, of Overcoming Jet Lag, which was a best seller in the mid-1980s but went out of print until she revised and republished it last year under a snappier title, The Cure for Jet Lag.

The book lays out a treatment system for jet lag based on pre-trip diet and conditioning to reset the body’s internal clock. The book suggests resetting the body clock so that it will be in sync with the time at the destination. One to three days before a trip, the authors suggest low-calorie meals. In flight, avoid or strictly limit alcohol, and use coffee or tea to persuade the body clock that it’s daytime. If it’s morning after flying all night, resist sleep and " flood your eyes with daylight " , they suggest.

While all long-haul travel can cause normal fatigue, travel across time zones causes the body to react with the most pronounced effects of jet lag, including disorientation and a general sense of discomfort.

In the last few years, the global airlines have put more emphasis on accommodating the need for in-flight sleep—at least in the business and first—class cabins, where international airlines earn most of their revenue. But at the same time, international airlines also promote extensive in-flight entertainment selections, as well as high-end menus, including quality wine lists, in premium classes. Indulging in these would seem to work against dietary treatment to combat jet lag. But Ms. Scanlon says recovery is nevertheless attainable.

" What do you do if you can’t implement this program ahead of the trip, or if you’ve blown it and had a complete debauch on the plane " she said, " Well, when you get off that plane, you get on the program right away. It may not be perfect, but you will feel much, much better.

According to Paragraph 5 and 6, which of the following statements is TRUE（）

A. Effects of jet lag after travels across time zones are most serious and obvious

B. Effects of jet lag are a sense of discomfort and the loss oforientation

C. Things have improved in recent years because the global airlines have emphasized on meeting the need for in-flight sleep

D. Enjoying the in-flight entertainment and high-quality food will make it impossible to recover from jet lag

流行性乙型脑炎邪犯卫气证的主要治法为（）

A.辛凉解表，清暑化湿

B.凉血清心，增液潜阳

C.清气凉营，泻火涤痰

D.通下攻里，化痰解毒

E.清热解毒，泻火涤痰

预测一次掷硬币的结果与预测一次掷骰子的结果相比，（）。

A.所含的自信息量更小

B.所含的自信息量更大

C.所含的自信息量一样

D.不能确定比较结果

在会展市场调研中，调研者置身于被调查者中间，亲临其间开展调查，记录市场中有关的事情真相及前景，取得更全面的市场资料和信息的方法称为（）。

A.实验法

B.间接观察法

C.直接观察法

D.记录法

接收清管器操作中，在打开快速盲板前必须（）。

A、请示调度同意

B、泄尽筒内余压

C、排净筒内存油

D、备好接收工具