题目内容
活塞式压缩机气阀常用结构形式是（ ）。
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Write the correct paragraph number from the reading next to its main idea.①Silk was highly valued by rich Europeans.②Deadly illnesses were carried by travelers on the Silk Road.③Although the Silk Road brought many good changes to the world, it also brought bad changes.④The Silk Road is a collection of roads that joined the East and West.⑤As people from different countries met, cultures began changing.
橱窗设计,它不仅仅是审美功能的展示，而是实用功能的强化。 橱窗的直接作用在于消费者看到橱窗后能立见功效，而不是无动于衷。
消费者在感知认识橱窗的这一过程，实际上就是视觉流程。
一个视图或两个视图可以确定物体的空间形状吗？
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