单项选择题

指挥设施系指各级人防指挥所，包括指挥所、通信站、广播站等设施。指挥所定员一般为30-50人，大城市可增加到100人。人均面积（ )。 A. 2-3㎡ B. 3-4㎡ C. 4-5㎡ D. 5-6㎡

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不定项选择

救助心脏呼吸骤停患者时，首先应该判断周围环境是否安全。

A．错误
B．正确

Does this sentence belong to the classification?
The second category is made up of those in animate objects, which find it extremely difficult to break down, and have evolved a different technique for resisting man -- to get lost.

答案：正确