Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.<br>A:east iron firings<br>B:mild steel fittings<br>C:small fittings<br>D:large fittings

Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.
A:east iron firings
B:mild steel fittings
C:small fittings
D:large fittings

出自：海船船员证

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