单选题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 （）.Aeast iron firingsBmild steel fittingsCsmall fittingsDlarge fittings
单选题
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
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