红外光谱仪的光源
A．汞灯或氙灯B．钨灯C．氢灯D．能斯特灯E．紫外光灯
参考答案：D
— It's bright enough in the room. Would you mind _____ the lights?
— No problem. [ ]
A. turn off
B. to turn off
C. turning off
D. turned off
间接盖髓术的适应证是
A．中龋B．浅龋C．意外穿髓D．去腐未净穿髓E．可复性牙髓炎
