A.20~90% B.30~100% C.20~95% D.30~95%
A.70% B.85% C.90% D.100%
A.標(biāo)準(zhǔn)孔板 B.標(biāo)準(zhǔn)噴嘴 C.文丘里管 D.1/4圓噴嘴