20. By SMCP, choose one of the following sentences for expressing “let go head line”?
(A) Slack on head line - heave in head line.
(B) Walk out head line - heave on head line.
(C) Walk to head line - heave away head line.
(D) Slack away head line - heave away head line.
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Let go 將指定的繫纜從纜樁上解開,...