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精磨在巧克力制造过程中起着怎样的作用?

题型:问答题 简答题

题目:

精磨在巧克力制造过程中起着怎样的作用?

答案:

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      I'm Nancy. My birthday is August 15th. I usually get up early on my birthday because I am too excited

to sleep. My parents usually give me a birthday present. I don't go to school on my birthday, because it's in

summer holidays (假期). Usually I have a birthday party. We have a big dinner and eat a birthday cake. We

also sing, dance and watch TV at the party. In the evening, my family goes out for a walk. I always have a

good time on my birthday.

1. Nancy's birthday is in ______________.[ ]

A. spring

B. summer

C. fall

2. Nancy usually gets up early on ______________. [ ]

A. Monday

B. July 20th

C. August 15th

3. Nancy usually ______________ on her birthday.[ ]

A. goes to school

B. has English class

C. has a birthday party

4. Nancy doesn't ______________ at the party.[ ]

A. play sports

B. watch TV

C. dance

5. Nancy goes out for a walk with her ______________.[ ]

A. family

B. friends

C. classmates

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硫化镉晶体是一种光敏材料,用它做成的电阻有一特性:被光照射时电阻很小,将光遮住时电阻很大.用它来控制照明灯,要求白天灯不亮,夜晚灯亮,请将图中的元件连接成符合上述要求的电路,并说明白天灯灭、晚上灯亮的工作原理.(图中电磁铁上方是带铁块的铜片,其右端上下各有一个开关,当电磁铁中无电流时,弹簧将铜片拉起,使其上方的开关(双箭头a、b表示)闭合;当电磁铁中有电流时,铁块受磁力作用拉下铜片,下方的开关(双箭头c、d表示)闭合.

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