The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.
举一反三
- At the top of the A-frames there is a strong cast iron frame called （）.
- On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
- 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.
- Steel is not as _____ as cast iron; it does not break as easily.
- An advantage of aluminum pistons， when compared to cast iron pistons is （）.