【多选题】污水中的有机氮分为颗粒性不可生物降解、颗粒性可生物降解、溶解性不可生物降解、溶解性可生物降解四部分,在生物脱氮处理工艺中,氮转化为氮气的是哪几项?
【单选题】系统微分方程为 ,已知 ,激励信号为 ,求
【单选题】What does the man want the woman to do?
【简答题】已知二阶线性非齐次微分方程的三个特解为y 1 =1,y 2 =x,y 3 =x 3 ,试求其通解及微分方程。
【单选题】what is not true about passport application? .
A.
First you should fill in the passport anulication form
B.
then submit all documents needed to the Immigration Administration of Hangzhou Municipal Public Security Bureau.
C.
You should pay 200 yuan for the handling.
D.
The rest you have to do is just waiting. In 15 working days.
【判断题】灰霉病的病菌为弱寄生菌,其侵入途径是伤口、衰弱的器官或死亡组织
【简答题】非离子型表面活性剂:直链比支链容易降解,支链越多,越难降解;芳基比脂肪烷基难降解;【 ( 写汉字) 】类表面活性剂是生物降解性最好的非离子表面活性剂。A. 烷基糖苷
【单选题】以下数组声明有语法错误的是_________。
【单选题】What's the expiration date on your passport?
B.
I will renew my passport in a few months.
C.
I think it's soon,maybe in a few months.
D.
I'll be here for about a year.
【简答题】生物修复的本质是生物降解,能否成功取决于生物降解速率,在生物修复中采取强化措施促进生物降解十分重要。这些强化措施促主要包括哪些方面?