The two factors which make underwater hull repair difficult are accessibility and the（）.<br>A:availability of tools<br>B:shape of the hull<br>C:pressure exerted by the water<br>D:threat of progressive flooding

The two factors which make underwater hull repair difficult are accessibility and the（）.
A:availability of tools
B:shape of the hull
C:pressure exerted by the water
D:threat of progressive flooding

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