循环水场投加过多的水稳定剂带来的后果是()。
A.微生物生长过快,并有可能生成大量磷酸盐软垢
B.产生过多的硫酸钙
C.产生过多的碳酸钙
D.A、B、C
参考答案:A
– What’s the matter? You really look down.
– _________.
A.Why, I always look up to you
B.Me? I never look down upon anybody
C.I am looking for my pen on the floor
D.I failed an important test
我国门脉性肝硬化的主要致病原因是
A.病毒性肝炎B.酒精中毒C.工业毒物或药物D.血吸虫病E.循环障碍