头皮血运丰富，抗感染与生长力较强，清创术可延长至()
A．6小时
B．12小时
C．24小时
D．36小时
E．72小时
参考答案：E
Individuals exposed to loud noise for long intervals may suffer temporary or permanently loss of hearing.
A．constant
B．permanent
C．consistently
D．constantly
普通硅酸盐水泥的初凝时间不大于45min，终凝时间不大于600min。
