A.0.7m; B.1m; C.1.7m; D.2.5m。
A.分閘時(shí)間; B.燃弧時(shí)間; C.分閘時(shí)間與燃弧時(shí)間之差; D.分閘時(shí)間與燃弧時(shí)間之和。
A.5mB.6mC.7mD.8m