Java的体系结构中，最下层是 【9】 ，由适配器和Java OS组成，保证Java体系结构可以跨平台。
参考答案：移植接口
涂料的遮盖力只和涂料的分散程度有关。（）
There _______ work for us to do every day. [ ]
A. is many
B. is some
C. are lots of
D. are much
