气液分离器的负压控制在（）kPa。A.-2 B.-5 C.-8 D.-12

为了防止航空器金属件之间发生电化学腐蚀，当不同金属的蒙皮板进行搭接时应采取什么措施（）。

A.至少在每个搭接面上涂—层铬酸锌底层涂料，让涂层完全干燥后，并用铆钉沾着铬酸锌涂料进行湿铆接

B.至少在每个搭接面上涂—层铬酸锌底层涂料，让涂层完全干燥后，并用铆钉沾着阿洛丁涂料进行湿铆接

C.螺拴的夹紧长度不能大于被连接件的厚度，否则会削弱螺栓的减切强度

D.至少在每个搭接面上涂—层铬酸锌底层涂料，在涂层潮湿时，用铆钉沾着阿洛丁涂料进行湿铆接

网络操作系统是一种（）。

上世纪90年代初期至90年代末，广西着眼对外开放和统筹协调，提出了（）等发展战略。

A.“一二三”

B.“三大战略、四大突破”

C.“三四五”

D.“三三二”

However important we may regard school life to be, there is no denying the fact that children spend more time at home than in the classroom. Therefore, the great influence of parents cannot be ignored or discounted by the teacher. They can become p allies of the school personnel or they can consciously or unconsciously hinder and frustrate curricular objectives.

Administrators have been aware of the need to keep parents informed of the newer methods used in schools. Many principals have conducted workshops explaining such matters as the reading readiness program, manuscript writing and developmental mathematics.

Moreover, the classroom teacher, with the permission of the supervisors, can also play an important role in enlightening parents. The informal tea and the many interviews carried on during the year, as well as new ways of reporting pupils’ progress, can significantly aid in achieving a harmonious interplay between school and home.

To illustrate, suppose that a father has been drilling Junior in arithmetic processes night after night. In a friendly interview, the teacher can help the parent sublimate his natural paternal interest into productive channels. He might be persuaded to let Junior participate in discussing the family budget, buying the food, using a yardstick or measuring cup at home, setting the clock, calculating mileage on a trip and engaging in scores of other activities that have a mathematical basis.

If the father follows the advice, it is reasonable to assume that he will soon realize his son is making satisfactory progress in mathematics, and at the same time, enjoying the work.

Too often, however, teachers’ conferences with parents are devoted to petty accounts of children’s misdemeanors, complaints about laziness and poor work habits, and suggestion for penalties and rewards at home.

What is needed is a more creative approach in which the teacher, as a professional adviser, plants ideas in parents’ minds for the best utilization of the many hours that the child spends out of the classroom. In this way, the school and the home join forces in fostering the fullest development of youngsters’ capacities.

The author does not directly state, but implies that（）

A.participation in interesting activities relating to a subject improves one’s achievement in that area

B.too many children are lazy and have poor work habits

C.school principals do more than their share in interpreting the curriculum to the parents

D.teachers should occasionally make home visits to parents

蒸发器退镁的操作顺序为（）和吹扫。

A.停浓镁泵

B.减加热蒸汽

C.破真空、停镁尾水泵

D.停稀镁泵、镁液倒流