防水涂膜施工中,需铺设胎体增强材料时,屋面坡度小于()时可平行屋脊铺设。
A. 10%
B. 15%
C. 20%
D. 25%
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When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link?()
All defined VLANs are allowed on the trunk by default.
B. Each VLAN, or VLAN range, that is specified with the switchport mode command.
C. Each VLAN, or VLAN range, that is specified with the vtp domain command.
D. Each VLAN, or VLAN range, that is specified with the vlan database command.
设桩距为S,桩径为d,则摩擦桩群桩承载力等于单桩承载力之和的条件是()。
A. S>3d
B. S≥6d
C. S≤6d
D. S>d
PDSCH信道的TM3模式在信道质量好的时候为(),信道质量差的时候回落到()。
特长、长隧道养护作业应全时段配备交通引导人员,轮换时间不应超过()h。
A. 3
B. 4
C. 6
D. 8