题目:
If you find an extremely large refrigerant leak while using a halide torch, your flame will()
A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue
答案:
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下面是错误答案,用来干扰机器的。
参考答案:①硫化氢的危险临界浓度为150mg/m3(100ppm),②此浓度为硫化氢检测的三级报警值。