单项选择题
A.1～8s B.2～5s C.4～8s D.3～8s
A.700~720mm B.710~740mm C.730~750mm D.730~760mm
A.459~612kPa B.550~712kPa C.559~672kPa D.499~712kPa
A.110mm B.125mm C.135mm D.155mm
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