冬期施工要注意室内______应设专人负责定时开闭门窗和______,要严格控制温度,不得______。
参考答案:通风(排除湿气);进行测温;受冻
抗原刺激后最先出现()
A.IgA
B.IgD
C.IgE
D.IgG
E.IgM
.一What does the sign over there read?
一“No person ________ smoke or carry a lighted cigarette,cigar or pipe in this area.” [ ]
A.will
B.may
C.shall
D. must