(8分)用适当方法将下列混合物分离开来 (1)不溶性固体与水的混合物,如CaCO

题型:实验题

问题:

(8分)用适当方法将下列混合物分离开来

(1)不溶性固体与水的混合物,如CaCO3与水,可用_______ 方法分离

(2)两种互相溶解但沸点相差较大的液体,如苯和四氯化碳的混合物,可用_______ 方法分离

(3)可溶性固体与水的混合物。如食盐和水,可用_______ 方法分离

(4)两种互不相溶的液体,如水和油,可用_______ 方法分离

考点:物质的分离离子的检验粗盐的提纯
题型:实验题

“Everything happens for the best,” my mother said whenever things weren’t going my way. “Don’t worry, one day your luck will change.”

Mother was right, as I discovered after I had finished my college education. I had decided to try for a job in radio. One day, I wanted to host(主持) a sports program. I went to Chicago and knocked on the door of every station. But I got turned down every time.

In one station, a kind lady said my problem was that I hadn’t got enough experience. “ Get some work with a small station and work your way up,” she said.

I went back home. I couldn’t get a job there, either. Then my dad told me a businessman had opened a store and needed someone to help him. But again, I didn’t get the job.

I felt really down. “ Your luck will change,” Mom said to me. Dad lent me the car to help me to look for my job. I tried another radio station in Iowa. But the owner, a nice man, told me he had already had someone.

As I left his office, I asked, “How can someone be a sports announcer(播音员) if he can’t get a job in a radio station?”

I was waiting for the lift when I heard the man call. “ What did you mean? Do you know anything about football?” He put me in front of a microphone and asked me to try to imagine that I was giving my opinion on a football game, I succeeded.

On my way home, Mom’s words came back to me, “One day your luck will change, Son. And when it happens, it’ll feel doubly(加倍的) good because of all the hard work you’ve had.” At that moment I knew what just what she meant.

小题1: What’s the writer’s ideal (理想的) job?

A.A sportsman

B.A shop assistant

C.A sports announcer

D.A businessman小题2:Why didn’t the writer get the job in Chicago? 

A.because he was too young

B.Because he didn’t get college education

C.Because he’s got a good-looking person

D.Because he hadn’t got enough experience小题3:Which of the following is true according to the article?

A.You just need wait for some time, then luck will come.

B.Luck will come if you try your best to do everything.

C.It’s important for you to wait for luck.

D.You should trust your mother.小题4:The sentence “But I got turned down every time.” Means “______”

A.But I was refused every time

B.But I was successful every time

C.But I lost my way every time

D.But the door of every station was always closed小题5:What’s the best title of this passage?

A.Mother’s words

B.Everything Happens For The Best

C.No One Is Always Lucky

D.To Find A Job In Radio Is Difficult

题型:实验题

(﹣a5)(﹣a)4=(     )

题型:实验题

选择性激动β2受体而扩张支气管的是

A.肾上腺素
B.特布他林
C.雷尼替丁
D.氯苯那敏
E.奥美拉唑

题型:实验题

轧机冷却水有什么作用?

题型:实验题

谈谈你所了解的鲁迅的读书方法。

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