计算题：某电感线圈，当接在f=50Hz，U=220v的正弦交流电上时测得线圈中I=4.38A，求线圈的电感。
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The minimum number and capacity of bilge pumps and fire pumps and their distributing within the ship is governed by （）.
A. Classification Society Rules
B. National requirements
C. The IMO International Convention for the Safety of Life at Sea
D. All of the above
合同补充协议中规定乙方需承担物业费不含本专柜区域的电费、空调费、柜台内设施维修费。
A. 正确
B. 错误
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