题目内容
做平面运动的四杆机构共有_____速度瞬心，其中有_____绝对速度瞬心。
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商务类图标“暖色”为主，颜色鲜艳绚丽，对比强烈，用于调动人的情绪，更快进入角色。
1.Listen to several short dialogues between a man and a woman, and then decidewhether the following statements are true (T) or false (F).[音频]1. The speaker is seventeen years old.
2. She lives with her grandparents.
3. Both her parents are retired.
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