创伤修复过程中出现瘢痕过硬,其主要原因是()
A.个体差异因素
B.皮肤缝合时对合较差
C.肉芽组织增生过多所致
D.成纤维组织增生所致
E.瘢痕内胶原量过多所致
参考答案:E
—Look! How long ______ like this?
—More than 20 days! It’s usual here that rain pours without stopping in May.
A.did it rain
B.is it raining
C.has it been raining
D.doesn’t rain
煤的成分按不含()和()来表示的分析结果,称为可燃基