下列对甲烷传感器报警浓度描述正确的是（）

A . ≥0.5 B . ≥0.8 C . ≥1.0 D . ≥1.5

A . ≥0.5 B . ≥0.8 C . ≥1.0 D . 1.5

A . ≧2.5%、﹤1.5% B . B、≧1.5%、﹤1.0% C . C、≧2.5%、﹤2.5% D . D、≧2.5%、﹤2.0%

A . A、1.0% B . B、2.0% C . C、2.5% D . D、3.0%

A . 0.5% B . 0.75% C . 1% D . 1.5%

A . 采煤工作面回风隅角 B . 采煤工作面回风巷 C . 采区回风巷 D . 井下煤仓

A . ≥0.5 B . ≥0.8 C . ≥1.0 D . ≥1.5

A . A．≥1.0％CH4；≥1.0％CH44；<1.0％CH4 B . B．≥1.5％CH4；≥1.5％CH44；<1.0％CH4 C . C．≥1.0％CH4；≥1.5％CH44；<1.0％CH4 D . D．≥1.5％CH4；≥1.0％CH44；<1.0％CH4

A . A、0.8%，1.0% B . B、1.0%，1.5% C . C、1.0%，1.0% D . D、1.5%，1.5%

A . 1% B . 0.5% C . 1.5%

A . ≥1.0%；≥1.5%；＜1.0% B . ≥1.5%；≥1.5%；＜1.0% C . ≥0.5%；≥1.0%；＜0.5% D . ≥1.5%；≥2.0%；＜1.5%

A . 采煤工作面：≥1.5% B . 采煤机：≥1.5% C . 掘进机：≥1.5% D . 瓦斯泵站室内≥0.5% E . 专用排瓦斯巷≥2.5%

A . ≧0.1% B . ≧0.5% C . ≧1.0% D . ≧1.2%

A . ≥0.5 B . ≥0.8 C . ≥1.0 D . ≥1.5

是 否

A．≥0.5%CH4，≥0.5%CH4，＜0.5%CH4 B．≥1.5%CH4，≥1.5%CH4，＜1.5%CH4 C．≥1.0%CH4，≥1.0%CH4，＜1.0%CH4 D．≥1.5%CH4，≥2.0%CH4，＜1.5%CH4

A．≥1.0 %CH4，≥1.5 %CH4，＜1.0%CH4 B．≥1.5%CH4，≥1.5%CH4，＜1.5%CH4 C．≥2.5%CH4，≥2.5%CH4，＜2.5%CH4 D．≥1.5%CH4，≥2.0%CH4，＜1.5%CH4

A．≥1.0%CH4，≥1.5%CH4，＜1.0%CH4 B．≥1.5%CH4，≥1.5%CH4，＜1.5%CH4 C．≥0.5%CH4，≥1.0%CH4，＜0.5%CH4 D．≥1.5%CH4，≥2.0%CH4，＜1.5%CH4

A．≥1.0%CH4，≥1.5%CH4，＜1.0%CH4 B．≥1.0%CH4，≥1.0%CH4，＜1.0%CH4 C．≥1.0%CH4，≥1.5%CH4，＜1.5%CH4 D．≥1.5%CH4，≥2.0%CH4，＜1.5%CH4

A．≥1.0%CH4，≥1.5%CH4，＜1.0%CH4 B．≥1.5%CH4，≥1.5%CH4，＜1.5%CH4 C．≥2.5%CH4，≥2.5%CH4，＜2.5%CH4 D．≥1.5%CH4，≥2.0%CH4，＜1.5%CH4

A．≥1.0%CH4,≥1.5%CH4,＜1.0%CH4 B．≥1.5%CH4,≥1.5%CH4,＜1.5%CH4 C．≥2.5%CH4,≥2.5%CH4,＜2.5%CH4 D．≥1.5%CH4,≥2.0%CH4,＜1.5%CH4

A．≥2.5、≥2.5、＜2.5 B．≥1.0、≥1.5、＜1.0 C． ≥1.0、≥1.5、＜1.0

A．≥0．5％CH4，≥0．5％CH4，＜0．5％CH4 B．≥1．0％CH4，≥1．5％CH4，＜1．0％CH4 C．≥1．5％CH4，≥1．5％CH4，＜1．5％CH4 D．≥1．5％CH4，≥2．0％CH4，＜1．5％CH4