按光波在时间、空间上的相位特征，将光源分为（）。

A. The tables being joined have NOT NULL columns.
B. The tables being joined have only matched data.
C. The columns being joined have NULL values.
D. The tables being joined have only unmatched data.
E. The tables being joined have both matched and unmatched data.
F. Only when the tables have a primary key/foreign key relationship.

A. 组分
B. 成熟期
C. 成熟度
D. 轻烃含量

A. 强酸树脂层；
B. 弱酸树脂层；
C. 强碱树脂层；
D. 弱碱树脂层。