公文处理程序中的核心工作是()
A.公文收文
B.公文起草
C.公文发文
D.公文审核
参考答案:A
His English is very _____ and he sings English songs very _____ . [ ]
A. fine; good
B. well; good
C. nice; fine
D. good; well
出铁见下渣时,适当在撇渣器渣铁表面撒一层(),可以起到保温作用,防止渣凉结壳。