@Poppendieck I don't understand how the second one could be correct. What does the H in ACH indicate if not (per) hour?
2.1 /h AC could possibly be correct but no one would recognize it.
@Poppendieck我不明白第二个怎么可能是正确的。如果不是(每小时),ACH 中的 H 表示什么?
2.1 /h AC 可能是正确的,但没有人会认出它。