ZZ8L-2.5型矿用隔爆煤电钻综合保护装置具有先导控制回路，利用电钻手把开关可对变压器供电线路进行控制，可以做到打钻时电缆带电，不打钻时电缆不带电。（）
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功能维护主要由（）完成？
A. 商行操作员
B. 商行复核员
C. 商行录入员
D. 商行管理员
Small quantities of flammable liquids needed at a work site should be（）.
A. used only under the supervision and direction of a ship's officer
B. tightly capped and stowed with other tools near the job site when securing at the end of the day
C. used only when a pressurized fire hose is laid out ready for immediate use
D. in a metal container with a tight ca
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