单项选择题
A.-10到—20kpa B.-20到—30kpa C.-30到—40kpa D.-40到—50kpa
A.0.10-0.15mpa B.0.15-0.20mpa C.0.20-0.25mpa D.0.15-0.25mpa
A.0.3-0.4mpa B.0.4-0.5mpa C.0.5-0.7mpa D.0.7-1.0mpa