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±0.20%CH4 ±0.10%CH4 ±0.01%CH4 ±0.05%CH4
≥1.0%CH4;≥1.0%CH44;<1.0%CH4 ≥1.5%CH4;≥1.5%CH44;<1.0%CH4 ≥1.0%CH4;≥1.5%CH44;<1.0%CH4 ≥1.5%CH4;≥1.0%CH44;<1.0%CH4
±0.20%CH4 ±0.10%CH4 真值的±10%CH4 真值的±20%CH4
≥1.0%CH4;≥1.0%CH4; ≥1.5%CH4;≥1.5%CH4; ≥1.0%CH4;≥1.5%CH4; ≥1.5%CH4;≥1.0%CH4;
CH3CI CH2CI2 CHCI3 CCI4 CCI3
0.2%CH4 0.4%CH4 0.3%CH4 0.01%CH4
CH3Cl CH2Cl2 CHCl3 CCl4 CCl3
±0.1%CH4 ±0.2%CH4 0.1%CH4 0.2%CH4
0.04%CH4,0.4%CH4 0.1%CH4,0.4%CH4 0.02%CH4,0.4%CH4 0.1%CH4,0.5%CH4
≥0.5%CH4,≥0.5%CH4,<0.5%CH4 ≥1.5%CH4,≥1.5%CH4,<1.5%CH4 ≥1.0%CH4,≥1.0%CH4,<1.0%CH4
构成它们的原子大小不同 δ-Fe、γ-Fe、α-Fe之间的相互转化是化学变化。 δ-Fe、γ-Fe、α-Fe一定由不同种类的铁原子构成 δ-Fe、γ-Fe、α-Fe里铁原子的排列不同
0.0t%CH4 0.02%CH4 0.05%CH4 0.03%CH4