合成氨生产主要泄露介质为氨的泄漏。泄露主要原因有以下几点（）；液氨、气氨管线泄漏；液氨装车管线及液氨槽车的泄漏。
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In your Cisco EIGRP network， you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）
An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B. The ARP cache was cleared.
C. The counters were cleared.
D. The IP EIGRP neighbor relationship was cleared manually.
硫的燃点温度为（）℃。
A. 200
B. 250
C. 300
D. 350
兆欧表使用前应将指针调到零位。
A. 正确
B. 错误
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