数控车床的对刀是车刀刀位点与（）的重合操作。
A、刀尖点
B、基准点
C、对刀点
D、原点
参考答案：C
最可能的诊断是
A．骨肉瘤
B．骨样骨瘤
C．内生软骨瘤
D．滑膜肉瘤
E．骨巨细胞瘤
—What would some students like to do after finishing their education?
—They would like to start to work ______ they needn't depend on their parents completely. [ ]
A. as soon as
B. so that
C. before
D. while
