相干
参考答案：
若两光场完全相关时，则形成的干涉条纹最清晰，称为相干
生态系统除了有生物外，还有非生物部分。
Lawrence Craven, a doctor from the USA, is the author of _____ several published reports, one of
introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks. [ ]
A. them; when
B. which; that
C. what; that
D. which; when
