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【单选题】
从生态系统总体上看,草、兔、鹰三种生物的数量应是( )
A.
草数量最多,兔和鹰数量相同
B.
草和兔的数量最多,兔比鹰数量多
C.
草数量最多,兔比鹰数量多
D.
草和兔的数量相同,鹰的数量最多
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参考答案:
举一反三
【单选题】三相异步电动机在什么情况下会出现转差率s<1,是
A.
再生制动
B.
能耗制动
C.
反接制动
D.
机械制动
【判断题】Beijing Opera came into being as a result of the classes from Anhui province constantly cooperating with artists in Han accent from Hubei opera.
A.
正确
B.
错误
【简答题】As a Beijing Opera actor, he is a great success ._________________________________________ Evidently all this talk caused him embarrassment ._______________________________________
【单选题】Antiseptics(杀菌剂) have saved countless lives, but they are most effective when the bacteria they are attacking are individual cells in suspension. Once bacteria have attached themselves to solid surfac...
A.
the bacteria are floating in individual cells
B.
the bacteria pollute the medical devices in the hospital
C.
the bacteria adhere to solid surfaces, wrapped by films
D.
the disinfectants are not so standard
【单选题】三相异步电动机在( )情况下会出现转差率s>1的情况。
A.
电动机运行状态
B.
电磁制动运行状态
C.
发电机运行状态
【判断题】Beijing Opera, as its name suggests, originated in Beijing but borrowed a lot from " Hui Tune".
A.
正确
B.
错误
【单选题】三相异步电动机在什么情况下会出现转差率s>1()。
A.
再生制动
B.
能耗制动
C.
反接制动
D.
机械制动
【单选题】三相异步电动机在什么情况下会出现转差率 s>l ,是?
A.
再生制动
B.
能耗制动
C.
反接制动
D.
机械制动
【单选题】三相异步电动机在 情况下会出现转差率s>1。
A.
再生制动
B.
能耗制动
C.
反接制动
D.
机械制动
【单选题】The program deals with subjects as ( ) as pop music and Beijing Opera.
A.
ideal
B.
diverse
C.
superficial
D.
exceptional
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