监理人员应当采用旁站、巡视和平行检验等方式作好( )控制环节工作。
A.投入
B.转换
C.反馈
D.纠正
参考答案:A
Jenny has a good sense of humour. She never makes us when she is with us.[ ]
A. to feel bored
B. feel boring
C. feel bored
D. to feel boring
灰铸铁中碳主要以()形式存在。
A.细小渗碳体
B.粗大渗碳体
C.片状石墨
D.团状石墨