The project _______ a success as the income of the company increases every year. 

A．is proved

B．had proved

C．has proved

D．has been proved

张口度检查中牙关紧闭是指

A．上下切牙切缘间距约3～4mm(三横指)
B．上下切牙切缘间距约2～2.5mm(二横指)
C．上下切牙切缘间距约1～2mm(一横指)
D．上下切牙切缘间距约＜lmm
E．完全不能张口