GB19147―2009《车用柴油》产品标准中,牌号的划分依据是什么?共分为哪几个牌号?
一份《登记表》只能在一家银行使用。《登记表》的有效期原则上不超过1个月()
A. 正确
B. 错误
皮质-纹状体-脊髓变性的中晚期可以出现典型的脑电图改变,对其描述正确的是()
A. 局灶性慢波
B. 每秒3次出现的棘慢波综合
C. 间隔0.5~2秒的周期性棘-慢复合波
D. 1.3~2.6Hz的负-正-负三向波
E. 1.3~2.6Hz的正-负正三向波
Which statement correctly describes enabling BPDU guard on an access port that is also enabled for PortFast?()
A. Upon startup, the port transmits 10 BPDUs. If the port receives a BPDU, PortFast and BPDU guard are disabled on that port and it assumes normal STP operation.
B. The access port ignores any received BPD
C. If the port receives a BPDU, it is placed into the error-disable state.
D. BPDU guard is only configured globally and the BPDU filter is required for port-level configuration.