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问题 多项选择题

不加电流阴极保护法通常采用（）等金属材料作为阳极。

A.铅

B.镁

C.锌

D.铁

答案

参考答案：B, C

补全对话，情景问答
根据问句选答语。
( )1. When is lunch?                          
( )2. What's the fourth day of the week?      
( )3. What's the seventh month?                
( )4. How many months are there in a year?    
( )5. Which month is the best for my birthday? 		A. I don't know.
B. At 12:00.    
C. Twelve.      
D. Wednesday.  
E. July.        
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单项选择题

SBR是（）橡胶弹性体。

A.丙烯腈-丁二烯-苯乙烯

B.苯乙烯-丁二烯

C.丙烯-丁二烯-苯乙烯

D.苯乙烯-丙烯腈
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