发现爆炸装臵后，应禁止无关人员触动，只有经过专门训练的（）人员才可以实施排爆。
A.公安
B.机场
C.安检
D.专职排爆
参考答案：D
The technological advances of the twentieth century have been brought about an alarming reduction of our natural resources.
A．for the price of
B．in favor of
C．in place of
D．at the expense of
巷道内淤泥、积水长度不超过（）m，深度不超过0.1m。
A.5
B.4
C.3
