题目：
The operating cord on an inflatable liferaft should be renewed by（）.
A.removing the top half of the shell，cutting the line at its source，and renewing completely
B.cutting the line where it enters the case and replacing that portion
C.leaving the original line and tying another one to it so the two lines will take the strain
D.an approved servicing facility ashore
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
