主厂房内架空电缆与热体管路应保持足够的距离，控制电缆不小于0．5m，动力电缆不小于1m，不能满足要求时必须采取可靠的隔离措施。
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The helm command PORT TWENTY means（）.
A. change course twenty degrees to the left
B. put the rudder left twenty degrees
C. put the rudder hard left for the first twenty degrees of swing
D. put the rudder left twenty degrees and then ease back as the vessel starts swinging
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