正弦规的测量精度与被测工件圆椎角和正弦规中心距有关，即被测工件圆锥角越大，正弦规中心距越小，测量精度越高.
参考答案：错
What's wrong _____________ your child? [ ]
A. with
B. in
C. at
D. about
抗体
