问题
单项选择题
What does the abbreviation SWL stand for?（）.
A.Signal wave letters
B.Ship without light
C.Safe water line
D.Safe working load
答案
参考答案：D
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What does the abbreviation SWL stand for?（）.
A.Signal wave letters
B.Ship without light
C.Safe water line
D.Safe working load
参考答案：D