小型养路机械上道作业时，（）应确认设置好防护。
A、施工负责人
B、驻站联络员
C、车站值班员
D、现场防护员
参考答案：A
—Let's go to watch the football match and cheer for our school team this afternoon, OK?
—Great! I'd like to. Which team will our team play _____? [ ]
A. to
B. against
C. on
D. in
大气压力的产生与哪项关系最密切（）。
A.基托面积大小
B.牙槽嵴高低
C.边缘封闭好坏
D.后堤区宽窄
E.粘膜厚薄
