单项选择题
A.102m3/h B.204m3/h C.335.7m3/h D.61m3/h
A.1.78×10-1 B.1.78×10-2 C.1.78×10-3 D.1.78×10-4
A.84.6% B.88.1% C.90.3% D.95.1%