A.永久氣體氣瓶 B.液化氣體氣瓶 C.乙炔氣瓶 D.所有氣瓶
A.無(wú)關(guān) B.成反比 C.成正比 D.正弦曲線變化
A.20 B.10 C.5 D.15
A.0.0010%~0.0050% B.0.0030%~0.0060% C.0.0030%~0.010% D.0.0050%~0.01%
純度:大于等于99.9%(VOL),含氧量<0.0008%,壓力≥0.55MPa。
A.25;0.3~0.4 B.28;0.4~0.45 C.38;0.4~0.45 D.28;0~0.2
A.軸 B.葉片 C.葉輪 D.機(jī)封