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【简答题】
二极管利用其 导电性及导通向压降 的特点,可用来进行限幅、开关、钳位等的应用。
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举一反三
【多选题】Read the statements and choose the ones that you think Zachary Blaine probably agrees with. Discuss your answers with a partner.
A.
Farm kids would like to do the things that city kids do.
B.
Most city kids get into trouble with drugs and alcohol.
C.
Growing up with a lot of responsibility is good for kids.
D.
It’s good for kids to visit places like museums, libraries, and theaters.
E.
Most city kids would like to grow up on a farm.
F.
City children might not get into trouble with guns, alcohol, and drugs if they had animals to take care of.
【多选题】对于接触角的影响因素,以下说法正确的是
A.
对指定固体，液体表面张力越大，接触角越大。
B.
对指定液体，固体表面能越大，接触角越大。
C.
固体表面，特别是高能表面能自发地从周围环境中吸附某些组分而降低表面能，同时也改变了表面性质，从而影响接触角大小。
D.
温度、液滴形成时间等因素都可能对接触角产生影响。
【单选题】( )反映了机构各种文献入藏情况的数目数据库,通过它可以查询某一文献在该机构是否有收藏或索书号
A.
期刊数据库
B.
馆藏目录查询系统
C.
学位论文数据库
D.
二次文献数据库
【单选题】If your farm had the only known source of a rare cocoa bean needed to make chocolate-covered peanuts, your monopoly would result from:
A.
control of a scarce resource or input.
B.
technological superiority.
C.
increasing returns to scale.
D.
government-set barriers.
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