Several blocks of magnesium are fixed to the bottom of a ship to (a) keep away the sharks (b) make the ship lighter (c) prevent action of water annd salt (d) prevent puncturing by under- sea rocks

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Several blocks of magnesium are fixed to the bottom of a ship to (a) keep away the sharks (b) make the ship lighter (c) prevent action of water annd salt (d) prevent puncturing by under- sea rocks
23
Nov
Several blocks of magnesium are fixed to the bottom of a ship to (a) keep away the sharks (b) make the ship lighter (c) prevent action of water annd salt (d) prevent puncturing by under- sea rocks Several blocks of magnesium are fixed to the bottom of a ship to (a) keep away the sharks [...]
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