Because the castings of smaller engines are not so big and heavy， （） and cylinder block may be made in one piece.
举一反三
- Smaller engines can be made more rigid than large ones and may not have （）.
- In some engines,the cylinder block also carries the ______ . A: camshaft B: crankshaft C: shaft D: countershaft
- Cylinder block is one of the most important parts in an engine.
- If these trousers are too big, buy a smaller ______. A: set B: piece C: pair D: suit
- It is very difficult to get from one place to another in Tokyo because （）. A: the city is so large and so high B: there is no traffic C: we don’t know the road D: the city is so large and the traffic is so heavy