【简答题】I think that it should be handled (delicate) ___________ .
【单选题】已知△ ABC 的三个顶点坐标分别是
D.
(3,4), C (-1,2), BD 是∠ ABC 的平分线,求点 D 的坐标及 BD 的长.
【判断题】换向阀是利用阀芯在阀体孔内作相对运动,使油路接通或切断而改变油流方向的阀。
【单选题】I think that it must be handled delicately .
【单选题】I think our boat can pass the treacherous water ______ cautiously handled.
【单选题】I must confess that this is the most ______ case I have ever handled.
【简答题】换向阀的作用是利用______使油路______、______或______。
【简答题】已知△ABC的三个顶点坐标分别是A(4,1),B(3,4),C(-1,2),BD是∠ABC的平分线,求点D的坐标及BD的长.