When male and female (M&F) or tongue and groove (T&G) type flanges are specified, the nozzle flange facing of the vessel shall be of female or groove type.
如指定使用外螺纹及内螺纹或榫面及槽面法兰，容器设备口法兰端面应为凹槽型。
In this section, you will hear 5 short dialogues. You will hear them only once. Listen to the dialogues and write "T" (true) or "F" (false) in the brackets for each of the following statements.
在这一段里，你将听到5个简短的对话，只播放一次。听完后，请在下面的每个陈述前面的括号里写”T”或”F”。
Compared with fossil diesel, biodiesel from waste cooking oil, DME from natural gas or coal, and F-T diesel from natural gas have economic competition.
与石化柴油比较，以废弃食用油或泔脚油为原料的生物柴油，以天然气和煤为原料的DME以及以天然气为原料的F—T柴油具有经济竞争力。
Compared with fossil diesel, biodiesel from waste cooking oil, DME from natural gas or coal, and F-T diesel from natural gas have economic competition.
与石化柴油比较，以废弃食用油或泔脚油为原料的生物柴油，以天然气和煤为原料的DME以及以天然气为原料的F—T柴油具有经济竞争力。
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