血浆蛋白质的pI大多为pH5～6，它们在血液中的主要存在形式是A．兼性离子 B．非极

现有两个小灯泡，分别标有“6V、1.2W”和“12V、6W”的字样．现这两个灯泡串联起来，为了使其中的一个灯泡持续正常发光，那么加在串联电路两端的电压应该是（　　）

A．9.4伏特

B．10.8伏特

C．18伏特

D．27伏特

阅读理解。

     A Yacht Race(帆船赛)Friday 25th June

     The wind has just dropped.

     Everyone is silent and depressed (沮丧的). So far this has been the worst and slowest leg of the race. We still haven't reached the English Channel.  

     Saturday 26th June

     At last We've just passed Land's End.However,with so little wind,we'Il probably take two more days

to reach Southampton. We're all very hungry. We have already finished all our food. Dawn discovered

some emergency rations(给养) －chocolate and glucose (葡萄糖)  tablets (药片) －so now we're eating those. Nobody has complained yet, but I know the girls are feeling quite low. Please God, send us some

wind.

      Monday 28th June 5:30 a. m.

      We can see some yachts waiting to welcome. It feels great but it is sad to think that after so many days we are almost at the end of our journey.

      Monday 28th June 11:45 a. m.

      We've done it! This is the most wonderful day of my life. Now I can rest. I said we could complete the race and we did!

根据短文内容回答问题。

1. What is very important in a yacht race?

2. What would happen with so little wind?

3. What did they eat after they finished all their food?

4. What time did they finish their journey?

5. What was the author's feeling when they arrived at last?

寒邪致病，症见肢体屈伸不利，是由于

A．寒客肌表，卫阳被遏

B．寒为阴邪，易伤阳气

C．寒性凝滞，痹阻经脉

D．寒性收引，筋脉挛急

宁夏红枸杞酒通常分为干型、干红型、半干型和半甜型。

全封闭制冷压缩机用的碟型保护器，其保护参数是（）。

A、电流和湿度

B、电抗和湿度

C、电流和温度

D、电压和温度