A. 在清理表面上产生一个锚链状轮廓 B. 经济的除去油和油脂 C. 处理表面而不影响区域内其他工人的工作 D. 不可用来进行上述工作
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