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问题 选择题

把ag铁铝合金粉末溶于足量盐酸中，加入过量NaOH溶液。过滤出沉淀，经洗涤、干燥、灼烧，得到红棕色粉末的质量仍为ag，则原合金中铁的质量分数为[ ]

A. 70%

B. 52.4%

C. 47.6%

D. 30%

答案

答案：A

完形填空
完形填空。
     My name is Du Li. My English teacher __1__ Laura. She is from the USA. __2__ has a son and a
daughter. __3__ is Ben. __4__ is Maria. Her husband is __5__.  Mr. Black is __6__. too. He and his
son are __7__ New York now. Mrs. Black and Maria are in China.__8__ are classmates, and we are
__9__. I teach her Chinese and __10__teaches me English.
( )1. A. be              
( )2. A. She            
( )3. A. His son        
( )4. A. His son        
( )5. A. Black Paul      
( )6. A. a student      
( )7. A. at              
( )8. A. Ben and I      
( )9. A. good friend    
( )10. A. he             		B. is                
B. Her                
B. His daughter      
B. His daughter      
B. Paul Black        
B. an English student
B. from              
B. I and Ben          
B. a good friend      
B. she                		C. am              
C. He              
C. Her son          
C. Her son          
C. Black Anna      
C. a Chinese teacher
C. in              
C. Maria and I      
C. good friends    
C. they             		D. are              
D. His              
D. Her daughter      
D. Her daughter      
D. Anna Black        
D. an English teacher
D. on                
D. I and Maria      
D. friend            
D. her              
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问答题 简答题

对传感器和测量系统进行的环境测试的环境指哪些内容？。
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