Directions: You are asked to write a composition according to the outline given below. Your composition should be not less than 120 words. You should write it clearly. (1)竞争是社会生活中常见的现象。 (2)我们发现竞争与合作共存。 (3)在竞争时也应合作。
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材料的磁导率越小则其磁阻也越小。( )
A. 对
B. 错
下贝氏体的硬度比上贝氏体的硬度高。( )
A. 对
B. 错
钢中含碳量越多则奥氏体晶粒越粗。( )
A. 对
B. 错
Directions: Study the following cartoon carefully and write an essay in which yo should 1)describe the cartoon briefly, 2)interpret the meaning revealed by it, and 3)give your point of view. You should write 160—200 words neatly.