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【单选题】Humans may not have landed on Mars (火星) just yet, but that isnt stopping a European company from devising a plan to send four people to the Red Planet within the next few years．(78)This project, calle...
A.
seven
B.
eight
C.
ten
D.
six
【单选题】A类火灾指的是下列哪种火灾。（ ）
A.
可燃金属如钾、钠、镁、钛、锆、锂、铝镁合金等燃烧的火灾
B.
指甲、乙、丙类液体如汽油、煤油、柴油、甲醇、乙醚、丙酮等燃烧的火灾
C.
指带电物体燃烧的火灾
D.
指含碳固体可燃物如木材、棉、毛、麻、纸张等燃烧的火灾