A.58mm B.60mm C.54mm D.62mm
A.前后兩點(diǎn)和為6mm B.前后兩點(diǎn)各為-6mm C.前后兩點(diǎn)和為3mm D.前后兩點(diǎn)各為-4mm
A.1‰ B.2‰ C.1.5‰ D.2.5‰