Deck : Deck General - 4528/5076
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| In general, an un-reinforced vessel can safely navigate in ice provided the concentration does not exceed how many tenths? |
| A) 9 - 10 tenths |
| B) 1 - 3 tenths |
| C) 4 - 6 tenths |
| D) 6 - 8 tenths |
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