与全口义齿大气压力的产生关系最密切的一项是()
A.基托面积大小
B.牙槽高低
C.边缘封闭区好坏
D.腭穹隆的高低
参考答案:C
There was a chance in a million that she might be right. Which of the following phrases can be used to replace “a chance in a million”?[ ]
A. the scarcest chance
B. the greatest chance
C. the remotest chance
D. the lightest chance
设备的额定电压与设备最高电压。
系统额定电压为3kV时,电气设备最高允许电压应为( )。
A.3.15kV; B.3.25kV; C.3.3kV; D.3.6kV。