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问题 单项选择题

灯丝发射特性曲线指（）

A.管电压为一定值时，灯丝加热电流与管电流的变量关系绘制成的曲线

B.灯丝发射电流与灯丝温度之间的关系曲线

C.灯丝加热电流与加热电压之间的关系曲线

D.灯丝加热电压为一定值时，管电压与管电流的关系绘制成的曲线

E.灯丝加热电压为一定值时，灯丝温度与管电流的关系绘制成的曲线

答案

参考答案：A

单项选择题

(四)


"Congratulations, Mr. Jones, it’s a girl. "
Fatherhood is going to have a different meaning and bring forth a different answer from every man who hears these words. Some feel proud when they receive the news, while others worry, wondering whether they will be good fathers. Although there are some men who like children and may have had considerable experience with them, others do not particularly care for children and spend little time with them. Many fathers and mothers have been planning and looking forward to children for some time. For other couples, pregnancy was an accident that both husband and wife have accepted willingly or unwillingly.
Whatever the reaction to the birth of a child, it is obvious that the change from the role of husband to that of father is a difficult task. Yet, unfortunately, few attempts have been made to educate fathers in this re-socialization process. Although many good books have been written about American mothers, only recently have some books discussed the role of a father.
It is argued by some writers that the transition to the father’s role, although difficult, is not nearly as great as the transition the wife must make to the mother’s role. The mother’s role seems to require a complete transformation of daily routine and adaptation to a new life, on the other hand, the father’s role is less demanding and immediate. However, even though we have mentioned the fact that growing numbers of women are working outside the homey the father is still thought by many as the breadwinner in the household.

The transition to the mother’s role requires that the wife ______.

A．changes her life style in a quite different way

B．makes a complete change in her everyday life to deal with the new situation

C．stays at home to take care of the baby

D．helps her husband in his re-socialization process
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配伍题 B1型题

机体的免疫监视功能低下时易患（）
机体的免疫自稳功能紊乱时易患（）
机体的免疫防御功能低下时易患（）
机体的免疫防御功能过高时易患（）

A.移植物排斥反应

B.免疫缺陷病

C.超敏反应性疾病

D.自身免疫病

E.恶性肿瘤
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