在立式车床上找正工件时，若工件内外圆存在椭圆，应按最大、最小直径取四点，决定工件的圆心。( )
参考答案：对
The policeman caught the thief ______ has stolen Mr. Li's computer. [ ]
A. which
B. whose
C. whom
D. who
何谓崩漏？
