单项选择题
As you hold a piece of manila line vertically in front of you，the strands run from the lower left to the upper right. Which type of line is this?（）
A.Right-hand laid
B.Cable-laid
C.Sennet-laid
D.Water-laid
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A.sufficient oxygen in a compartment to support life
B.combustible gases present
C.hydrogen gas present
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An on-load release system on a survival craft means the cable can be released（）.
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