液压传动可实现无级调速,并且调速范围很大,可达()。
A. 100:l~500:1
B. 100:1~1000:1
C. 100:1~1500:1
D. 100:1~2000:1
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FabricPath brings the benefits of routing protocols to layer 2 network Ethernet environments. What are the advantages of using FabricPath technology? ()
A. FabricPath provides MAC address scalability with conversational learning
B. Loop mitigation with TTL in the frame field
C. STPl independence
D. 10 Gbps bandwidth
E. Layer 2 extensions between data center
下列关于胸椎的错误叙述是()。
A. 共12个
B. 横突上有横突孔
C. 椎体侧面和横突尖端上有肋凹
D. 棘突伸向后下方