题目内容

梯形螺纹的特征代号为（）。（从M、Tr、B、G）中选择。

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气动方向控制阀按其作用特点可分为单向型和换向型两种。（）

液压缸按结构分为活塞式、柱塞式、叶片式和伸缩式等四种。

Metaphor is continuous and incomplete categorization. Tenor and vehicle have their own respective categories while the process of metaphor projecting is from vehicle categorization to tenor categorization, which is one-way and nonreversible.

1866年春“黄鹄”船在南京下关试航成功（）