咬肌间隙感染临床表现有()
A．张口受限
B．凹陷性水肿
C．可扪及波动感
D．疼痛
E．有压痛点
参考答案：A, B, D, E
To their deep sorrow, there was nothing left ______ the city except ruins after the violent earthquake, which turned the whole city into a silent world.
A．in
B．of
C．for
D．with
防御雷电电磁脉冲干扰的理想方法是什么？（）
A.接地
B.采用屏蔽
C.避雷针
D.设备分布合理
