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
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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
对称成缆,绞合规则为(2+8+14+19),则成缆直径为绝缘直径的()倍。
A. 8.0
B. 8.154
C. 9.0
D. 1.0