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【单选题】
(B-D-008)当同步电机有P对磁极时,转子转动一,定子绕组的感应电势就交变P 波,所以频率等于( )。A.
50 Hz
B.
60 Hz
C.
Pn/60
D.
60 n/p
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举一反三
【单选题】川楝子不应有的特征是
A.
少数凹陷或皱缩,具深棕色小点
B.
呈圆锥形或扁圆锥形“牛奶头”状
C.
有6~8条纵棱,内分6~8室
D.
顶端有花柱残痕,基部凹陷,有果梗痕
【单选题】Il y a longtemps que les scientifiques ont mis l’action du tabac sur les poumons et ses mauvais effets.
A.
en lumière
B.
au point
C.
en pratique
D.
en application
【单选题】What is the function of but in the sentence "I’ve neverseen anyone look up, butin my mind’s eye an American tourist may notice it and smile, and a French passerby may be reminded of thedate and the oc...
A.
To tell the reader the possible disadvantage if the existing cultural differencesall disappear as a consequence of the on-going globalization.
B.
To show the diminishing difference betweenAmerican culture and European culture.
C.
To express the author’s wish that American tourists maynotice the flag and be reminded of their national identity.
【单选题】_______ il a posé la tête sur l'oreiller, il s'est endormi
A.
Tant
B.
Tant qu'
C.
Dès
D.
Dès qu'
【单选题】Apparue en 1989, la question du port __________ voile à l'école est à nouveau sur le devant de l'actualité.
A.
de la
B.
du
【单选题】Which of the following is NOT true, according to the passage?
A.
It was the first time that the author crossed the street by himself.
B.
It was the first time that the author went in that garage.
C.
The author bought the Coca-Cola from a vending machine.
D.
The author’s grandpa kept an eye on him the whole time.
【单选题】Which of the following is NOT true，according to the passage?
A.
It was the first time that the author crossed the street by himself．
B.
It was the first time that the author went in that garage．
C.
The author bought the Coca—Cola from a vending machine．
D.
The author’S grandpa kept an eye on him the whole time．
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