A lot of it is trial and error.（）A、这事儿在很大程度上须要反复实验、不断摸索。B、这个过程需要反复试验，纠正错误，不断逼近。C、做这事儿的很大一部分是摸石头过河。D、这个过程是会有反复的，其中很多情况下须要使用逐步逼近法。
A lot of it is trial and error.（）
- A、这事儿在很大程度上须要反复实验、不断摸索。
- B、这个过程需要反复试验，纠正错误，不断逼近。
- C、做这事儿的很大一部分是摸石头过河。
- D、这个过程是会有反复的，其中很多情况下须要使用逐步逼近法。
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名词解释题药物临床试验（drug clinical trial）