A.60%~70% B.50%~80% C.50%~70% D.60%~80%
A.4個(gè) B.5個(gè) C.6個(gè) D.7個(gè)
A.0.1~0.2MPa B.0.2~0.5MPa C.0.8~1.0MPa D.1.0~2.0MPa