图示为轴套零件图,<img src="https://nimg.ppkao.com/2018-09/tangxueping/2018091114411437389.jpg?sign=9784456f3db4bdf290edc025aefcc961&t=62d49c5f" />。因A<sub>2</sub>不便测量,试用极值法计算工序尺寸A<sub>3</sub>及其偏差。<br /> <img src="https://nimg.ppkao.com/2018-09/tangxueping/2018091114402640419.jpg?sign=e7b67ac17502e9ccc6af212ffc8547a5&t=62d49c5f" /> A<sub>3</sub>的下偏差为()mm。
A、+0.1
B、+0.02
C、-0.1
D、-0.2