炉前槽起火如何处理？
参考答案：开灭火蒸汽阀，待火焰熄灭后持续开蒸汽一段时间后关闭阀门。
Of her plays, three were __________ and one was ___________ failure.
A．success; /
B．successes; /
C．success; a
D．successes; a
固定批量法是指每次的加工或订货数量相同，同时加工或订货间隔期也相同的批量计算方法。( )
