A.3mm B.4mm C.5mm D.6mm
A.200×200×200mm B.150×150×150mm C.100×100×100mm D.115×115×115mm
A.工程經(jīng)驗(yàn) B.保證率95% C.滿足β=3.2的要求 D.滿足β=3.7的要求