ZY-750煤矿用钻机主要用于煤矿井下钻进瓦斯抽(排)孔、()、()、防突卸压孔、地

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ZY-750煤矿用钻机主要用于煤矿井下钻进瓦斯抽(排)孔、()、()、防突卸压孔、地质勘探孔及其它工程孔。主要适用于坚固系数f≤8的各种煤层、岩层。要求巷道或钻场断面大于6.5m2,高度大于()m,宽度大于2.8m。

考点:露天钻机考试露天钻机考试题库
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阿魏的性状特征是()

A.呈不规则小块,常黏结成团,表面橙黄色,有蜡样光泽。气芳香,味微辛,嚼之有沙粒感

B.呈不规则块状或脂膏状,块状者质地似蜡,脂膏者黏稠。有蒜样特异臭气,味辛辣

C.略呈类圆四方形或方砖形,表面暗红色,有光泽,气微,味淡

D.呈不规则颗粒状或结成团块,表面红棕色或黄棕色,气香而特异,味甘而微辛

E.呈半流动的浓稠液体,棕黄色:极黏稠.挑起时呈胶状,连绵不断。气芳香,味辛辣,嚼之不黏牙

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窝沟封闭术的基础是

A.酸蚀技术的应用

B.釉质结构、牙本质结构的了解

C.酸的发明

D.粘结树脂的发明

E.酸蚀技术和粘结树脂的发展与完善

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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 directly discusses the fact that()

A. parents drill their children too much in arithmetic

B.principals have explained the new art programs to parents

C. a parent’s misguided efforts can be properly directed

D. a father can have his son help him construct articles at home

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什么是清水、软化水、脱盐水?

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块状植物造景

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