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易蒙停的通用名是（）。用于控制急慢性（）。

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R1, an ABR between backbone area 0 and area 1, has intra - area routes in area 0 for 10.1.1.0/24,10.1.2.0/24, and 10.1.3.0/24. These routes have metrics of 21, 22, and 23, respectively. An engineer then adds the area 0 r ange 10.1.0.0 255.255.0.0 command under the OSPF process of R1. Which of the following is true?（）

A. R1 loses and then re - establishes neighborships with all neighbors.
B. R1 no longer advertises 10.1.1.0/24 to neighbors into area 1.
C. R1 advertises a 1 0.1.0.0/16 route into area 1 with a metric of 23 (largest metric).
D. R1 advertises a 10.1.0.0/16 route into area 1 with metric of 21 (lowest metric).

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企业培训中有没有外部性问题？如何避免这种现象的发生？

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胸外心脏按压的主要目的是造成胸腔内压力的变化，促使血循环。

A. 正确
B. 错误

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直放站挂壁式安装时，设备底部距离地面一般应大于（）或（）。

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