At the top of the A-frames there is a strong cast iron frame called （）.
D
举一反三
- （） of the A-frames there is a strong cast iron frame called the scavenging air box.
- On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as（）
- The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.
- Frames to which the tank top and bottom shell are fastened are called（）.
- 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.
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在HTML语言中，定义框架的标记是（） A: 〈Frames〉 〈/Frames〉 B: 〈Table〉 〈/Table〉 C: 〈Form〉 〈/Form〉 D: 〈Frame〉 〈/Frame〉
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Steel is not as _____ as cast iron; it does not break as easily.
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Suppose that the demand for picture frames is elastic and the supply of picture frames is inelastic. A tax of $1 per frame levied on picture frames will decrease the effective price received by sellers of picture frames by
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An advantage of aluminum pistons， when compared to cast iron pistons is （）.
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Cast iron carrier rings， （） machined grooves， are provided for all the pistons.