气缸的圆柱度误差
参考答案：
被测气缸表面任意方向，测得的最大最小直径差值之半。
在有余数的除法算式中，除数是a商是b（a，b均不为0），被除数最大是[ ]
A．ab+a-1
B．ab+a
C．ab
—Where were you just now?
—I _____ to a student in my office when you called. [ ]
A. talk
B. talked
C. is talking
D. was talking
