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【单选题】
尿酮体中乙酰乙酸、β-羟丁酸和丙酮分别约占A.
2%、78%、20%
B.
20%、78%、2%
C.
78%、2%、20%
D.
2%、20%、78%
E.
78%、20%、2%
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反馈参考答案：
举一反三
【多选题】直流电动机的调速方法以下说法正确的是
A.
调节电枢电压调速，属于无极平滑调速方法，调速范围宽
B.
电枢回路串电阻只能是有级调速，所串电阻上消耗电能，不经济
C.
弱磁升速，调速范围窄，一般与调压调速相配合使用
D.
自动控制的直流调速系统往往以变压调速为主
【单选题】听力原文：To Americans, between 'black' and 'white' there are no other races. Someone with one black and one white parent looks black. Which of the following is NOT true about average Americans?
A.
They think there is a distinction between those purely white and the rest.
B.
They do not think there is much difference between black and brown races.
C.
They think black people include only those of purely African origin.
D.
They do not think it is good for a white person to marry a black one.
【多选题】下列选项中,属于分程控制系统的应用范围的有( )。
A.
用于扩大调节阀的可调范围
B.
用于一个控制回路控制多个操纵量
C.
用于控制两种物料的配比
D.
用于对主副参数进行串级控制
【单选题】The United States is a country made up of many different races. Usually they are mixed together and cant be told from one another. But many of them still, talk about where their ancestors came from. I...
A.
reads at about 245 w. p. m.
B.
reads at 600 w. p. m.
C.
reads at about 300 w. p. m.
D.
cannot read difficult works in translation
【简答题】You will watch 2 clips from the film The Color of Friendship, first played on the Disney Channel in 2000. The story is about the friendship between 2 girls from different cultural and ethnic backgroun...
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