A: 正确
B: 错误
举一反三
- The cylinder block is a complicated casting made of gray iron(cast iron) or aluminum. 这句话的意思是机体是复杂的灰铸铁或铸镁件。 A: 正确 B: 错误
- Gray cast iron has () A: high compressive strength B: excellent machinability C: good casting characteristic D: all of these
- An advantage of aluminum pistons， when compared to cast iron pistons is （）.
- In ancient time，there was no iron casting，so the needles were made of ______. A: stone B: tree C: iron D: mental
- The metal utensils made from iron, copper and aluminum are forbidden to decoct drugs.
内容
- 0
On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
- 1
将以下段落翻译成中文：The cylinder head is bolted to the block. The manufacture casts the cylinder head in one piece from iron, from iron alloyed with other metals, or from aluminum alloy. Aluminum has the advantage of combining lightness with rather high heat conductivity.Depending on the style of engine, the cylinder head serves many functions.
- 2
In addition to iron and carbon, list the other elements that may be found in a grey cast iron and describe their effect on the properties of a grey cast iron.
- 3
Metal utensils such as iron, copper, or aluminum are appropriate to prepare decoctions.
- 4
Egyptian weapons made from meteoric iron occurred about 3000 B.C.. 这句话的意思是用陨铁制造的埃及武器出现在公元前3000年左右。 A: 正确 B: 错误