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【单选题】
俄国植物学家茨维特用石油醚为冲洗剂,分离植物色谱时采用( )。A.
吸附色谱
B.
分配色谱
C.
离子交换色谱
D.
体积排阻色谱
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举一反三
【单选题】The reason ___ the bus was late is there was an accident just now.
A.
why
B.
when
C.
where
D.
which
【单选题】机场控制区应当根据( )的需要,划定为候机隔离区、行李分检装卸区、航空器活动区和维修区、货物存放区等,并分别设置安全防护设施和明显标志。
A.
保证安全
B.
正当防卫
C.
安全保卫
D.
安全防护
【简答题】There is an old story telling about a woman whose only son died in an accident. In her 26 , she went to the wise man that is always 27 for his wisdom in her town and said, “What advice or what 28 ways...
【单选题】Mr. Smith found that gas from the pipe when he came back because we forgot to switch off. But at last we were lucky to escape .
A.
escaped, being punished
B.
was escaping, being punished
C.
escaped, punishment
D.
was escaping, punishing
【简答题】We left in such a hurry that we forgot to lock the door.
【简答题】如图所示，三相异步电动机的机械特性与恒转矩负载的机械特性(转矩大小不随转速变化)交于A、B两点(T L 等于额定电磁转矩T N )，与风机负载的机械特性(转矩近似与转速的平方成正比)交于C点。不计空载转矩，试问：在A、B、C三点中，电动机能在哪些点稳定运行?能在哪些点长期稳定运行?
【简答题】They feel that it is only a matter of time before there is an accident as a lot of the children walk to the school.
【单选题】—Why is the classroom so dirty? —Sorry，sir. It yesterday, We forgot to do it.
A.
doesn’t clean
B.
didn’t clean
C.
isn’t cleaned
D.
wasn’t cleaned
【单选题】It is reported______there was an accident in town yesterday.
A.
where
B.
which
C.
here
D.
that
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