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【多选题】
2 三相异步电动机在额定负载转矩下运行时,如果电压降低,则转速( )(前三项中选),电流( )(后三项中选)。A.
n增高
B.
n降低
C.
n不变
D.
I增大
E.
I减小
F.
I不变
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反馈参考答案：
举一反三
【单选题】According to the passage, which of the following determines the shape and coloring of the plumage of a given species of bird within a given ecological niche?
A.
The emergence of a competing species who rely upon the same food source as the first species
B.
The physical appearance of the food supply available in the niche to the given species
C.
The ability of the first species to collect and make use of the nutritional properties of the food within in the niche
D.
The physical appearance of rival males within the species who compete for both the same food supply and females
E.
The physiological effects on fertility of the food available in the niche
【简答题】下列计算正确的是（ ） A． 3 - 3 =0 B． 3 + 3 = 3 C． 3 × 3 = 6 D． 3 ÷ 3 =3
【单选题】What has the inflation brought about to the US and Britain according to the passage?
A.
High jobless rate.
B.
Economic depression.
C.
A hard conduct of monetary policy.
D.
The increase of capacity utilization.
【判断题】The methods of marketing will naturally vary according to their size and also according to the type of goods and the nature of the market.
A.
正确
B.
错误
【简答题】证明：（x+y+z） 3 xyz-（yz+zx+xy） 3 =xyz（x 3 +y 3 +z 3 ）-（y 3 z 3 +z 3 x 3 +x 3 y 3 ）．
【简答题】（x 3 -2y 3 -3x 2 y）-（3x 3 -3y 3 -7x 2 y）
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