单项选择题
A.1/3处 B.1/4处 C.1/5处 D.1/6处
A.0.1%~0.4% B.0.2%~0.8% C.0.3%~0.9% D.0.4%~1.2%
A.100~150mm B.150~300 mm C.200~250mm D.250~300mm
A.增大 B.减小 C.不变 D.无法估计
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