在非STE的例句中，安全指令给出的是“注意”，但是如果了解氧气系统的话，也应知道氧气会造成爆炸。
A.In the STE example, this safety description is given as a caution, but if you know about oxygen systems, you also know that oxygen can occur explosions B.In the non-STE example, this safety instruction is given as a caution, but if you know about oxygen systems, you also know that oxygen can cause explosions C.In the non-STE example, caution is given in this safety description. But if you know about nitrogen systems, you also know that nitrogen can cause flames,正确答案B
