着火温度是可燃气体在空气中能引起自燃的最低温度。
参考答案：对
Attention, please, there _______ a football game between China and South Korea this evening.[ ]
A. is going to be
B. has been
C. has
D. will have
当釉质因磨损等遭受破坏，其深部牙本质暴露后，相应髓腔部位产生的牙本质是
A．前期牙本质B．继发性牙本质C．透明牙本质D．修复性牙本质E．原发性牙本质
