大学MOOC Soilless Culture(Northwest A&F University)1458253167 最新慕课完整章节测试答案

Chapter 1 Overview(1)

1、单选题：
​In 1840, ________, a German chemist, put forward mineral nutrition theory of plants taking minerals as nutrition, which laid a theoretical foundation for scientific soilless cultivation.‌
选项：
A: Wigman   
B: Boussingault  
C: Liebig  
D: Sax
答案: 【 Liebig  】

2、单选题：
‏American scientists_______ showed the necessity of adding trace elements based on the results of experiments, and released the standard formula of nutrient solution accordingly.‌
选项：
A: Wigman and Boussingault                
B: Boiussingault and Anon 
C: Sax and Norbert                    
D: Hoglaland and Anon
答案: 【 Hoglaland and Anon】

3、多选题：
‏Common solid medium of soilless cultivation include ( ).‎‏‎
选项：
A: grass charcoal      
B: perlite     
C: rock wool    
D: gravel
答案: 【 grass charcoal      ;
perlite     ;
rock wool    ;
gravel】

4、多选题：
​Depending on the fact whether the cultivation beds are applicable to solid medium materials, the soilless cultivation is divided into ( ) and ( ).‏​‏
选项：
A: hydroponic cultivation                
B: soil medium cultivation   
C: non-solid medium cultivation          
D: aeroponic cultivation
答案: 【 soil medium cultivation   ;
non-solid medium cultivation          】

Chapter 2 Nutrient solution(1)

1、单选题：
‍Water hardness for nutrient solution shall be no more than _______.‍
选项：
A: 8°  
B: 10°  
C: 15° 
D: 20°
答案: 【 15° 】

2、单选题：
‍Mother solution C of nutrient solution mainly contains ____________.‏
选