核对检查单并检查所有项目，如测量氧气含量，检验爆炸点，防爆灯和通风。
Check all items in the checklist such as test of content of oxygen test of explosion point exploded-proof lamp good ventilation.
核对检查单并检查所有项目，如测量氧气含量，检验爆炸点，防爆灯和通风。
Check all items in the checklist, such as test of content of oxygen, test of explosion point, exploded-proof lamp, good ventilation.
测量现有的电热水器所占有的空间(包括必要的管道，通风和燃气连接)，注意现有的热水器容积大小。
Measure the space where the existing electric water heater now sits (including necessary plumbing, venting and gas connections) and note its existing tank size.
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