作业人员进入气调仓检查粮情或进行膜上作业,不得少于()。
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使用手持电动工具必须戴好()或采取脚下绝缘措施,并使用合格可靠的漏电保护器。
A. 绝缘手套
B. 棉手套
C. 线手套
D. 短五指手套
Should the vessel have no deratisation certificate at the time of her delivery,she()be held to be unseaworthy.
A. shall
B. should
C. may
D. would
20kV系统主变进线及分段断路器的额定操作循环为()。
A. O-0.3s-CO-130s-CO
B. O-0.5s-CO-150s-CO
C. O-0.5s-CO-180s-CO
D. O-180s-CO-180s-CO