单项选择题
A.9.8KN B.14.7KN C.20KN D.50KN
A.0.3~0.5MP B.0.5~0.6MP C.0.5~0.9MP D.1.0~1.2MP
A.0.2~0.3MP B.0.4~0.5MP C.0.6~0.7MP D.0.7~1.0MP