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问题 单项选择题

公式：企业管理费费率＝生产工人年平均管理费/年有效施工天数×(人工单价+每一工日机械使用费)×100%是以( )为计费基础。

A．直接费

B．人工费

C．人工费和机械费

D．机械费

答案

参考答案：C

不定项选择题

二氧化氮与水反应中， 下列说法中正确的是　 [ ]

A.氮元素的化合价不发生变化 .  　

B.二氧化氮只是氧化剂.  　

C.二氧化氮只是还原剂.  　

D.二氧化氮既是氧化剂又是还原剂
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改错题
单句改错。
每个句子有且仅有一处错误,或错一词,或多一词,或少一词.
如本句多一词,把多余的词用斜线( \ )划掉；
如本句错一词,在错词下划一横线,并在横线下写出改正后的词；
如本句缺一词,在缺词处加一个漏字符号(∧),并在下面写出该加的词.
 
1. Don't worry. I've arranged a car to meet the new coming president.              
2. One day I was wandering in street when I caught the sight of a tailor's shop.
3. Mrs. Brown was sad to see the machine she had had  repaired went wrong again.    
4. Don't worry about me. I'l l be back on my foot again.                            
5.You have left off a zero in the telephone number.                                  
6.I lost sight of Wang Ping when we reached where looked like a large market.        
7.Now when people refer to England, you find Wales including as well.                
8.The drought is becoming increasingly severely.                                    
9.The doctor gave me some medicine to cure me for my headache.                      
10The governor instructed that a wall was built around the city.                     		__________    
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