松落针病、杉木散斑枯病等由孢子传播的病害属于土传病害。
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《工程建设安全健康与环境管理办法》规定定期安全检查的主要内容有哪些？
《维规》对应急通信的一般规定中要求，事故发生在区间，应在（）h开通电话。
A. 0.5
B. 1
C. 2
D. 3
By default, which of the following factors determines the spanning-tree path cost?（）
A. It is the individual link cost based on latency
B. It is the sum of the costs based on bandwidth
C. It is the total hop count
D. It is dynamically determined based on load
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