金属表面渗碳后必须进行()才能起到改进材料性能的作用。
A、退火
B、调质
C、淬火和回火
D、正火
参考答案:C
根据已给的首字母给各句空白处填上一个适当的词,使句子完整、正确。
小题1:Last year Cindy was thirteen years old. And tomorrow will be her f birthday.
小题2:How can you make y understood (明白) if you cannot express clearly?
小题3:Don’t open the door until the car s _ .
小题4:Christmas is the most important holiday in w countries.
小题5:Today is so cold. The temperature is b zero.
小题6:You’ll have to speak louder. The old man is a bit d .
小题7:This teapot is made of glass. It’s broken e .
小题8:Susan didn’t get m until she was thirty-nine.
小题9:Ted got an A in this English test b of his hard work.
小题10:My sister Tracy is m interested in sports than in music.
目前谈判中最大的公平在于()。
A、机会的公平
B、时间的公平
C、钱财的公平
D、地位的公平