| 手工或自动惰性气体保护钨极电弧焊（带不可熔焊条) |
Manual and automatic inert gas tungsten Arc welding with unmeltable electrode [GTAW] |
| 手动阀 |
Manually-operated valve |
| 制造者，制造厂 |
Manufacturer |
| 马氏体不锈钢 |
Martensitic |
| 平炉钢（马丁钢) |
Martic steel |
| 玛谛脂保护层 |
Mastic weatherproof coating |
| 接续线 |
Match line [M.L.] |
| 等级分界 |
Materical Specification break |
| 材料情况报告 |
Material status report [MSR] |
| 材料统计 |
Material take-off [MTO] |
| 最大 |
Maximum [Max.] |
| 机械式疏水阀 |
Mechanical trap |
| 中碳钢 |
Medium-carbon steel |
| 中压 |
Medium pressure [M.P.] |
| 元件 |
Member |
| 金属膨胀式蒸汽疏水阀 |
Metal expansion steam trap |
| 金属软管 |
Metal hose |
| 金属保护层 |
Metal jacketing |
| 金属填料 |
Metallic stuffing |
| 米 |
Meter |
| 计量泵 |
Metering pump |
| 公制螺纹 |
Metric thread |
| 毫米 |
Millimeter |
| 百万帕斯卡 |
Million Pascal [Mpa] |
| 矿（渣）棉 |
Mineral wool |
| 最小 |
Minimum |
| 错位 |
Mismatch |
| 斜接弯 |
Mitre bend |
| 斜接弯头 |
Mitre elbow |
