TB/T2658.21—2007标准规定，焊缝轨腰部位双探头探伤时，K型扫查其灵敏度如何校准？
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当船舶的中纵剖面垂直于水平面而基平面却不平行于水平面时的浮态是纵倾。（）
A. 正确
B. 错误
The following was configured on a switch： Switch（config） # spanning-tree portfast bpdufilter default What is the effect of this configuration command？（）
A. If BPDUs are received by a port configured for PortFast， they are ignored and none are sent.
B. The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level.
C. If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state.
D. If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally.
E. None of the other alternatives apply.
某轮船长180m，根据IMO及我国的要求，其空船压载航行时的最小平均吃水dM为（）m。
A. 5.60
B. 3.60
C. 4.16
D. 2.16
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