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【多选题】
下列有关废气再循环的说法正确的是( )。A.
废气再循环有利于提高发动机的动力性和经济性
B.
废气再循环可以使最高燃烧温度降低,从而减少NOX的生成量
C.
废气再循环有利于提高发动机的排气净化性能
D.
废气再循环控制是一种发动机机外净化的排气污染控制方式
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举一反三
【单选题】紫外-可见分光光度法测定的灵敏度高,准确度好,一般其相对误差在
A.
不超过 ±0.1 %
B.
1%~4%
C.
5%~20%
D.
5%~10%
E.
0.1%~1%
【多选题】The following are true of the classical Greek theater
A.
Although the names of numerous tragedians are known to us, the plays of only two survive.
B.
At first, the chorus served as both the collective actor and the commentator on the events of the drama; it became increasingly important with the development of Greek theater.
C.
It is one of the most important and famous insitution of Greek civilization.
D.
It rose originally in connection with the worship of Dionysus.
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