分配色谱分离是以分配作用为主,根据不同的物质在两相之间的分配比不同所进行的分离称为色

题型:判断题

问题:

分配色谱分离是以分配作用为主,根据不同的物质在两相之间的分配比不同所进行的分离称为色谱分离法。( )

考点:食品检验工高级技师食品检验工技师、高级技师
题型:判断题

阅读理解。

     My brother, John, is a college student. Last year he went to Italy and stayed for two months. I was

surprised that John was able to have such a long holiday, because he never had any money.

     "How did you manage it, John?" I asked."I thought you were going to stay for two weeks."

     "It was easy," John answered."I got a job."

     "A job?"I asked in surprise."What did you do?"

     "I gave English lessons to a shop manager," John answered.

     "His name is Luigi. We have become good friends."

     "But you' re not a teacher," I said.

     "I told Luigi I couldn't teach,"John explained."But he insisted on having conversation(会话) lessons. He

wanted to practice his English. He had a lot of American customers, so it was important for him to speak

English. I spent three hours a day talking to him. In return he gave me a room, three meals a day and a little

pocket of money."

     "Did your pupil learn much English?" I asked.

     "I don' t know," John said,"but I learnt a lot of Italian."

1. The writer was surprised that John was able to stay in Italy for ______.

2. John was able to have a long holiday in Italy because he taught a shop manager to ______.

3. John' s pupil was ______.

4. John spent _____ talking to his pupil  every day.

5. — Why did the shop manager ask John to teach him English?

    — Because ______.

题型:判断题

急性肾盂肾炎选择药物的依据是()

A.尿中细菌计数

B.病人症状

C.尿沉渣涂片革兰染色检查

D.尿培养及药物敏感试验

E.以上都不是

题型:判断题

制图标准对图纸的幅面及图框尺寸作了统一规定,A2图纸尺寸为()。

A.841mm×1189mm

B.594mm×841mm

C.420mm×594mm

D.297mm×420mm

题型:判断题

两人收卷水带的方法中,盘卷好的水龙带两金属连接头差距小于()厘米.

A.10

B.20

C.30

题型:判断题

开采厚度等于或小于()的保护层时,必须检验保护层的()。如果保护层的实际保护效果不好,在开采被保护层时,还必须采取防治突出的补充措施。

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