小肠将吸收的氨基酸运输到大脑，在大脑中经脱氨基作用后，将含氮部分运输到肝脏加工，然后运输到肾脏，并经泌尿系统排出体外。这一系列过程，氮至少有几次穿过了细胞膜（）
A. 10次
B. 12次
C. 16次
D. 20次
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生态护林员的申报中，符合条件的贫困人员根据自身条件和意愿，向（）申报，提交相关资料。
A. 县林业局
B. 当地镇（办）林业工作站
C. 镇政府
D. 村委会
In which of the following scenarios would the "show cdp neighbors detail"command be an appropriate troubleshooting tool?（）
A. Two switches are connected via a trunk. Both switches have been assigned an IP address, subnet mask, and default gateway. A ping is successful between the two switches. However, VLAN information is not passed from one switch to the other switch.
B. A router and a switch have been assigned an IP address, a subnet mask, and a default gateway. They are directly connected, but a ping between the two devices fails.
C. A router connects to another router through a serial interface. Both routers have been assigned an IP address, subnet mask, and default gateway. The routers are running RIP and the networks directly connected to the first router do not pass to the second router. However, a ping from one router to the serial interface of the directly connected neighboring router is successful.
D. A router connects to another router via a switch. Both routers and the switch have been assigned an IP address, subnet mask, and default gateway. Neither the routers nor the switch are able to ping one of the hosts that is directly to the switch.
根据公约规定，承运人对货币、可流通证券、黄金等贵重物品的灭失或损坏不负责任，除非（）.
A. 旅客已事先向承运人声明
B. 旅客和承运人均同意为安全的目的由承运人保管，并已交给承运人保管
C. 承运人同意保管该贵重物品
D. 签发提单，并装于货舱内
“两学一做”的“做”是指做先进分子。
A. 正确
B. 错误
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