水轮发电机技术供水水源一般取自哪里?
参考答案:
(1)、坝前取水;
(2)、涡壳取水。
选择填空。
I like this story-book because it's very _____. [ ]
A. cute
B. interesting
C. smart
有机溶剂沉淀(降低介电常数)