什么是平整场地？如何计算工程量？
CO2具有一定的渗透和环绕能力，因而扑救甲类火灾时不易发生复燃。
In most cases，the mere reception or dumping down of the cargo on the ship（）involve completion of loading，because the operation of loading involves all that is required to put the cargo in a condition in which it can be carried． ["is not","has not","do not","does not"]
若是一般可燃物质失火，着火范围又不大，可立即使用附近的灭火器材进行扑救；若火势较大，无能力扑灭，应立刻逃离火灾现场。
In a charter-party，the amount of despatch money payable is often fixed（）. ["at one fourth the demurrage rate","at one third the demurrage rate","at half the demurrage rate","at the demurrage rate"]
建筑物的变形缝如何计算？
