设计数器直接测周的分辨力为1ms，若采用多周期测量法，欲将测周分辨力提高到0.1μs

—            are you going to school'?

—At seven o'clock.[ ]

A. Where

B. What    

C. When

下列属于池塘生态系统中消费者的是

A．青蛙

B．水草

C．细菌

D．水

输配电价标准的审批机关是（）。

A.国务院

B.国家发改委

C.国家电监会

D.国家能源部

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.

______ are the first formal socialization agents.

A．Infant nurturers

B．Family members

C．Group peers

D．School teachers

铣削铸铁箱体工件的平面时，采用大进给量，而（）的进给量可达1000mm／min以上。

A.立铣刀

B.圆柱铣刀

C.三面刃铣刀

D.端铣刀