A.Z=X−Y<0 B.Z=X−Y>0 C.Z=X−Y≤0 D.Z=X−Y≥0
A.0.25×10−5/h B.0.25×10−4/h C.0.25×10−3/h D.0.25×10−2/h
A.2~10 B.10~20 C.10~30 D.10~50