车刀有（）、端面车刀、切断车刀、内孔车刀等几种。
A.外圆车刀
B.三面车刀
C.尖齿车刀
D.平面车刀
参考答案：A
桩冠的桩距根尖至少
A．0.1mm B．0.2mm C．0.3mm D．0.5mm E．1.0mm
. We are trying to ring you back, Harry, but I think we ______ your number incorrectly.
A．looked up
B．worked out
C．took down
D．brought about
