题目内容
机构处于死点位置时，其传动角等于90度。
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极位夹角就是从动件在两个极限位置的夹角。
机构是否存在死点位置与机构取哪个构件为原动件无关。
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Read Text C and then finish the exercises.a. they invented it b. they practice it a lot c. they do it bettera. a sight of breathtaking beauty __________b. an outstanding achievement __________c. an act of abominable cruelty __________d. an unforgivably stupid misjudgement __________5) Why do most foreigners find the English understatement hard to get?
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