单项选择题

“一通三防”中的三防指（）

A.防治水灾
B．防治瓦斯
C．防治煤尘
D．防治火灾

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单项选择题

当空气中氧气的浓度降到（）时，有生命危险

A.10～12%
B．8～12%
C．8～10%
D．9～10%

Describe a second language you would like to learn(except English and your mother tongue) you should say: what the language would be how you would learn it what equipment or facilities you would need

答案：我想要学习的第二语言是西班牙语。西班牙语是全球第二大使用人数的语言，广泛分布于欧洲、美洲、非洲和亚洲的许多国家。学习西班...