Please tell me about the falling weight experiment mentioned in 150
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Does this mean that two conditions must be met at the same time to do the drop weight test? Just use the word "和" before and after it satisfies one.
Yes and yes are both satisfied. If or, you only need to satisfy one of them.
My personal understanding is that if one of them is met, a drop weight test can be additionally performed.
One of them is the need to increase the drop weight experiment