A. 顺纹抗压 B. 顺纹抗拉 C. 横纹抗压 D. 横纹抗拉
A. steam rather than gas is used to turn a shaft B. vapor rather than gas is used to turn a shaft C. the former uses gas to turn a shaft D. the latter uses gas to turn a shaft
A. 正确 B. 错误
A. 28;8 B. 28;10 C. 26;8 D. 26;10