在酸性气体脱除工艺中,低温甲醇洗与热碳酸钾法相比,前者具有下列明显的特点()。
A、可以同时除去变换气中的多种杂质
B、流程简单
C、吸收剂容易起泡
D、净化度高
参考答案:D
_______ you may have, you should gather your courage to face the challenge.
A.However a serious problem
B.What a serious problem
C.However serious a problem
D.What serious a problem
简述作物干物质积累的规律?