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问题 单项选择题

使用磁轭法时，探伤区域应限制在两磁极连线的两侧相当于下述之磁极间距的面积范围内（）。

A、1/2的磁极间距

B、1/3的磁极间距

C、1/4的磁极间距

D、3/4的磁极间距

答案

参考答案：C

填空题

The average age for women to marry is between 18 and 25.25 tend to (1) when somewhat older. A church wedding often (2) the legal civil ceremony, and a large reception, which often involves (3) music and dancing, is held in the evening. Wedding traditions include (4) money on the bride’s dress to represent future prosperity, the groom (5) the bride at her home, and the couple pulling on opposite (6) of a loaf of bread—whoever gets the largest piece will be (7) boss of the family. Honeymoons are a new tradition.
The principle (8) mutual support is valued in the Bulgarian family. The elderly are (9) cared for by their adult children. Unmarried adults live with their (10) and many newly married couples live with one set of parents (11) they are able to get housing of their own. Most families (12) urban areas live in apartments, which are in short
supply, while (13) in rural areas usually have their own houses. Many village houses (14) owned by families who live in urban areas, who use them_ (15) summer and weekend retreats, or for retired parents.
Most families in (16) areas do not have more than two children, while families in (17) areas tend to be larger. Grandparents play an important role in (18) care, particularly in urban areas, where most women work outside the (19) . Men of the younger generation have begun to help with household (20) , once considered only women’s responsibility.
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单项选择题

晶体管过压保护器的保护动作为：（）.

A.使本身的两个端子间相当于开路

B.汇流条通过“ALTFLD”断路器对地短路

C.直接断开发电机输出电路，“ALTFLD”断路器不会跳开

D.降低发电机的励磁电流，使发电机输出电压回到正常值
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