A.經(jīng)濟(jì) B.標(biāo)準(zhǔn) C.功率 D.極濃
A.0.43 B.0.88 C.1.11 D.1.43
A.0.4~0.6 B.0.8~1.1 C.1.3~1.5 D.1.5~2.2