长方体(非正方体)最多有______个面完全相同,最多有______条棱长度相等

题型:填空题

问题:

长方体(非正方体)最多有______个面完全相同,最多有______条棱长度相等.

考点:长方体的认识,正方体的认识
题型:填空题

若抛物线y=(m-1)xm2-m开口向下,则m=______.

题型:填空题

从K、C、S、H、O、N六种元素中选择适当的元素按要求填空。

(1)用适当的数字和符号填空。

①三个钾离子____;

②一个碳酸根离子______;

③双氧水中氧显-1价____。

(2)写出符合下列要求的物质的化学式。

①能灭火的气体____;

②充入食品包装袋中可防腐的单质____;

③能形成酸雨的空气污染物是____。

题型:填空题

沸腾炉底料铺设的厚度一般为()左右。

题型:填空题

A

In order to know a foreign language thoroughly(完全地), four things are necessary. First, we must understand the language when we hear it spoken. Secondly, we must be able to speak it ourselves, correctly with confidence and without hesitation(犹豫). Thirdly, we must be able to write it. We must be able to make sentences that are correct in grammar.

There is no short way to succeed in language learning. A good memory is a great help, but it is not enough only to memorize the rules from a grammar book. It is no much use learning by heart long lists of words and their meanings, studying the dictionary and so on. We must learn by using the language. If we are pleased with a few rules we have memorized, we are not really learning the language. We must “Learn through use”. Practice is important. We must practice speaking and writing the language whenever we can.

小题1:The most important things to learn a foreign language are_______.

A.understanding and speaking

B.hearing, speaking, reading and writing

C.writing and understanding

D.memorizing and listening小题2:One can never learn a foreign language well only by_______.

A.much practice

B.studying the dictionary

C.learning through use

D.using the language小题3:“Learn through use” means_______.

A.we use a language in order to learn it

B.we learn a foreign language in order to use it

C.we can learn a language well while we are using it

D.both B and C

题型:填空题

下列属于一次能源的是()。

A.高炉煤气

B.转炉煤气

C.天然气

D.水煤气

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