电泵启动时,断联锁还是投联锁,联锁投入代表什么意义?

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问题:

电泵启动时,断联锁还是投联锁,联锁投入代表什么意义?

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Dear Dad,    

         I’m writing to you from Beijing. You don’t know how happy I am to be here. Mother and I arrived here on the night of 10th. Auntie met us at the station. The next morning, we got up early. It was Sunday and Uncle took us out for a ride on the bus. Everything was so beautiful, I was so excited, so was mother.  

       That afternoon Auntie took us to Beihai Park. First we climbed the hill, then we went boating on the lake, While we were there, we met some overseas Chinese. They come back to visit every year. They are proud of(以…为骄傲)China because it is stronger and more beautiful every day.   

       I haven’t seen the Summer Palace yet, but Uncle has promised(允诺) to take me there and to the zoo this coming Sunday. Yesterday Uncle took me to see his factory.A week has passed. I’ve seen and heard a lot of interesting things.

      I’ve written down most in my diary. I’ll tell you more next time.It’s time for bed, so I’ll close here. Hope to hear from you soon.                                                           

                                                                                                                        Love

                                                                                                                        Hua

1.Where did Hua write the letter? In ________.

A. Beihai Park      

B. the Summer Palace

C. Beijing

D. Shanghai

2. How many days have Hua and her mother stayed to the time she wrote the letter? ________.

A. A week.    

B. Eight days

C. Ten days.

D. Eleven days.

3. What day did Hua see her uncle’s factory? ________.

A. Monday

B. Tuesday

C. Sunday

D. Saturday

4. When did they arrive in Beijing? ________.

A  Aug. 10th.

B.Aug. 11th.

C. Aug. 12th.

D. Aug. 12th.

5. Which sentence is true? _______.

A. Hua comes from the USA.

B. Hua comes from England.

C. Hua’s parents are in China now.

D. Hua may be a overseas Chinese.

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对RBC渗透脆性试验的叙述正确的有哪些?()

A.是测定RBC对不同浓度盐水的抵抗力

B.是测定RBC对不同浓度低渗盐水的抵抗力

C.是测定RBC的抗溶能力

D.有助诊断与RBC形态有关的血溶性贫血

E.测定RBC在盐水中溶解程度

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如图中种群在理想环境中呈“J”型曲线增长(如甲);在有环境阻力条件下呈“S”型曲线增长(如乙),下列有关种群增长曲线的叙述正确的是  

[ ]

A.环境阻力对种群增长的影响出现在e点之后

B.若此图表示细菌的生长曲线,则选育菌种扩大培养常在 b~d时期进行

C.若此图表示菜青虫的种群增长曲线,则虫害的防治应在c点开始

D.若此图表示酵母菌的种群增长曲线,当种群数量达到d点时,种群增长率最大

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《针灸大全》的作者是()

A.滑伯仁

B.皇甫谧

C.杨继洲

D.李学川

E.徐凤

题型:问答题 简答题

彩色多普勒成像不可以与哪种超声技术并用()。

A.M型超声心动图

B.伪彩色编码二维超声显像

C.经颅多普勒(TCD.技术

D.双功超声仪的连续波多普勒

E.心腔超声造影

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