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【单选题】
下列对协助扩散的描述,不正确的是( )A.
转运速率高,存在最大转运速率
B.
需要膜转运蛋白的“协助”
C.
对物质的转运是非特异性的
D.
物质由高浓度侧向低浓度侧转运
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举一反三
【单选题】Why will it be fun having a baby in the woman's family?
A.
Because they are all excited about the baby.
B.
Because everyone wants to take care of the baby.
C.
Because they are all adults in the family now.
D.
Because the baby will bring them a lot of laughter.
【简答题】影响干涉条纹可见度的因素有相干光束的振幅比、( )和( )。当两列相干光波的振幅比是1:2，干涉条纹的可见度为( )。
【简答题】A．Getting presents from classmates. B．Having a big dinner with the family. C．Sleeping late every day. D．Having a vacation from school.
【单选题】The family when they are having dinner together on the Spring Festival Eve.
A.
give each other the best wishes
B.
buy each other presents
C.
sing， dance and play cards
【单选题】My family is having a hard time watching the film with your children ____all over the theater.
A.
run
B.
running
C.
ran
D.
runs
【单选题】查询出EMP表中COMM字段为空的记录( )
A.
select * from emp where comm='';
B.
select * from emp where comm=null;
C.
select * from emp where nvl(comm)=0;
D.
select * from emp where comm is null;
【单选题】影响干涉条纹可见度的因素很多,对于理想的相干点光源发出的光波来讲,影响干涉条纹清晰的主要因素是
A.
两相干光的振幅比
B.
两相干光的位相差
C.
两相干光的频率
D.
环境因素
【简答题】食品有脂肪的存在形式有__________和___________。
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