MPLS TE中备份LSP也存在故障可能,没有保护机制,当它失效时不能进行快速重路由。
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硬质梯子的横档应嵌在支柱上,阶梯的距离不应大于()并在梯顶1米处设限高标志
节流压井管汇试压应试到额定工作压力,稳压时间不得少于()min,保证无渗漏。
视觉信息特征提取理论中,目前大体有两种功能柱理论,即()理论和()理论。
Any oil tanker which is not required to be provided with segregated ballast tanks in accordance with this paragraph may,however,be qualified as a segregated ballast tanker ()it complies with the other requirements of paragraphs of this Convention.
A. provided that
B. on the part of
C. nevertheless
D. notwithstanding