单选题The two factors which make underwater hull repair difficult are accessibility and the（）.Aavailability of toolsBshape of the hullCpressure exerted by the waterDthreat of progressive flooding
单选题
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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