《维规》规定,轨头下颏透锈长度超过()为重伤钢轨。
A. 20mm
B. 25mm
C. 28mm
D. 30mm
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浮标运行历时≥100s,记至()s,运行历时≤100s,记至()s。
Which three of the following steps are mandatory when configuring MPLS on Cisco IOS? ()(Choose three.)
A. start LDP
B. enable CEF switching
C. configure the MPLS ID
D. disable IP TTL propagation
E. configure conditional label advertising
F. enable label switching on frame mode interface
催化重整生产芳烃的原料馏分范围应为()
A. 80-180℃
B. 60-145℃
C. 60-85℃
D. 85-110℃
《住宅设计规范》规定:住宅外窗、窗台距楼、地面净高低于()m时,应有防护措施。
A. 0.8m
B. 0.90m
C. 1.05m