置于
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
Under no circumstance _____ to tell lies to parents.
Under no circumstance \_\_\_\__ to tell lies to parents.
Only when he finished his homework _____ that he had made a mistake.
Only when he finished his homework \_\_\_\__ that he had made a mistake.
_____ I in your position, I would not accept the job.
\_\_\_\__ I in your position, I would not accept the job.
Walking down the street the other day, _____.
Walking down the street the other day, \_\_\_\__.
By no means _____ to our plan for the trip.
By no means \_\_\_\__ to our plan for the trip.
如图所示，刚性导线框的一部分置于磁感应强度B＝0.5T的匀强磁场中，边ab＝4cm，当导线框中通有I＝2A、方向沿abcda的电流时，导线框所受的安培力的大小为____N，安培力的方向为____．
如图所示，刚性导线框的一部分置于磁感应强度B＝0.5T的匀强磁场中，边ab＝4cm，当导线框中通有I＝2A、方向沿abcda的电流时，导线框所受的安培力的大小为\_\_\_\_N，安培力的方向为\_\_\_\_．