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【判断题】
当配备永磁式电动机的刮水器开关在高速档位置时,由于电动机电枢绕组产生的磁场方向与永久磁铁的磁场方向,不是成相互垂直关系的,而是偏转了一个角度。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】设有关系模式销售(顾客号,商品号,销售时间,销售数量),若允许一个顾客在不同时间对同一个产品购买多次,则此关系模式的主码是
A.
顾客号
B.
产品号
C.
(顾客号,商品号)
D.
(顾客号、商品号、销售时间)
【单选题】Jenny __________in the kitchen when you called her at 5 o’clock this afternoon?
A.
is cooking
B.
was cooking
C.
cooks
D.
cooked
【判断题】Eugene O’Neil,Arthur Miller and Tennessee Williams are together called “founders of the American drama.”()
A.
正确
B.
错误
【单选题】All the firemen in the city were ______to fight against the big fire.
A.
called in
B.
called off
C.
called up
D.
called on
【单选题】What did scientists think was true?
A.
Each person has a fixed weight range．
B.
Each person has a weight ranged of 9 kg．
C.
Each person wants to control his weight．
D.
Each person wants to eat to his heart’s content．
【单选题】People believe that each person has a rightful(合法的) and protected place in the social order.
A.
LOW
B.
HIGH
【简答题】汽车采用无回油管的燃油系统主要是为了 油箱温升。
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