安装气灭喷嘴时,应按设计要求逐个核对其型号、规格及喷嘴方向,全数检查。安装在吊顶下不带装饰罩的喷嘴,其()不应露出吊顶;安装在吊顶下的带装饰罩的喷嘴,其()应紧贴吊顶,应全数检查
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采区下部车场按轨道上山绕道位置不同,可分为()和()两种。
All entries in the Official Logbook must be signed by the Master and().
A. the Chief Engineer
B. the person about whom the entry concerns
C. one other crew member
D. No other signature is required.