在家庭电路中，火线和零线之间的电压是 ______，控制电灯的开关和电灯应 __

俄罗斯位于北冰洋沿岸的重要港口是

A．符拉迪沃斯托克

B．苏维埃港

C．圣彼德堡

D．摩尔曼斯克

凝集反应的抗原是（）

A.可溶性抗原

B.完全抗原

C.半抗原

D.超抗原

E.可溶性抗原吸附于载体颗粒或颗粒性抗原

患者，男性，25岁，因外伤后脑出血入院，遵医嘱20%甘露醇250ml静脉滴注，要求在30分钟内滴完。如所用输液器的点滴系数为15滴/ml，滴速应为

A．140滴/min
B．135滴/min
C．130滴/min
D．125滴/min
E．120滴/min

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’’s basic understanding of the world around it. This is the infant’’s first introduction to the language that shapes perception and elicits emotion.Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

Peers are one of the ________agents of socialization.

A．formal

B．indirect

C．primary

D．personal

一个二元函数的几何图形是（）。

A.二维空间中一段曲线

B.三维空间中一段曲线

C.三维空间中一个曲面

D.三维空间中一个立体