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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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elastic engine mountsC
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考题
单选题（） of the A-frames there is a strong cast iron frame called the scavenging air box.A
At the topB
At the bottomC
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考题
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cylinder linerB
cylinder coverC
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考题
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cylinder linerC
piston crownD
cylinder cover
考题
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regions where they are used
考题
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the piston rodD
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考题
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考题
单选题Cast iron pistons used in large propulsion diesel engines are constructed with （）A
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the skirt being tapered and smaller than the crownC
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考题
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east iron is a cheap materialB
cast iron can pollute sea waterC
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考题
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单选题Fittings used for towing must be（）.A
Coast Guard approvedB
stamped with maximum working loadsC
securely fastenedD
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考题
单选题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）A
twice as large as with a cast iron pistonB
the same size as with a cast iron pistonC
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考题
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pipe spinner
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