Word可以制作Web网页。
参考答案:对
Students are required to _______ down what the teachers teach in class. Which of the following is
wrong?[ ]
A. set
B. put
C. write
D. make
地下水除铁时,首先可采用曝气装置,曝气的作用是向水中充氧和散除少量水中CO2,以提高()
A.COD含量
B.含氧量
C.pH值
D.BOD含量