问题
问答题 简答题
活塞杆的作用是什么？
答案
参考答案：
活塞杆的一端连接十字头，另一端连接活塞。其作用是将十字头的往复运动传递到活塞。
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活塞杆的作用是什么？
参考答案：
活塞杆的一端连接十字头，另一端连接活塞。其作用是将十字头的往复运动传递到活塞。
Passage One
What does the galaxy look like
A．If you were above it and look down on it, it would look like a flat and round watch.
B．If you looked at it from its edge, it would look like the Milky Way.
C．If you looked at it from its inside, it would look like a large watch.
D．If you looked up, it would look like a night sky.