审判人员、检察人员、侦查人员必须依照法定程序，收集能够证明犯罪嫌疑人和被告人( )的各种证据。

A．有罪、犯罪情节重

B．无罪、犯罪情节轻

C．有罪或者无罪、犯罪情节轻重

D．有罪或者无罪

One of the limitations of foam as an extinguishing agent is that foam（）.

A.cannot be made with salt water

B.is heavier than oil and sinks below its surface

C.is corrosive and a hazard to fire fighters

D.conducts electricity