Only when he finished his homework _____ that he had made a mistake.
Only when he finished his homework \_\_\_\__ that he had made a mistake.
置于
Under no circumstance _____ to tell lies to parents.
Under no circumstance \_\_\_\__ to tell lies to parents.
为确定工件相对于刀具的位置，应将工件置于机床或夹具中定位。只要被约束的自由度少于6个，则该定位属于欠定位
为确定工件相对于刀具的位置，应将工件置于机床或夹具中定位。只要被约束的自由度少于6个，则该定位属于欠定位B
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