瓦斯检查制度有哪些规定？为什么检查瓦斯不准"空班漏检"？
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The 213.115.77.0 network was subnetted using a /28 subnet mask. How many usable subnets and host addresses per subnet were created as a result of this?（）
A. 2 networks with 62 hosts
B. 6 networks with 30 hosts
C. 16 networks and 16 hosts
D. 62 networks and 2 hosts
E. 14 networks and 14 hosts
F. None of the above
关键活动通常总时差为（）
A. 0
B. 1
C. 2
D. 3
习近平要求用（）兑现承诺。
A. 实践
B. 时间
C. 结果
一般情况下，运输能力在一定时期内会保持一个相对平衡，运输量则成一个跳跃性的变化。
A. 正确
B. 错误
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