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要使三极管处于放大状态,发射结必须(),集电结必须()。
下列各项中,作为诊断心肌坏死最特异和敏感的首选标志物是()。
A. 肌红蛋白
B. CK-MB
C. 肌酸激酶
D. 碱性磷酸酶
E. TnI或TnT
Which four statements about Ethernet virtual circuit (EVC) infrastructure are true? ()
A. EVC infrastructure is a Layer 3 platform-independent routing architecture that supports IP overEthernet services
B. Ethernet flow point (EFP) is configured on the main interface
C. Feature commands like MQC-based QoS policies can be specified
D. EVC infrastructure is a Layer 2 platform-independent bridging architecture that supports Ethernetservices
Each Ethernet flow point (EFP) matches a predefined VLAN tag-based criteria
F. Ethernet flow point (EFP) is configured on the VLAN interface