简述避免汽阻断流的措施。
What can be determined from the line of show ip route output shown in the exhibit?（） [" The next routing update can be expected in 35 seconds."," The IP address 10.10.10.6 is configured on S0\/1."," The IP address 10.10.10.8 is configured on S0\/1."," This route is using the default administrative distance."," The 10.10.10.8 network is two hops away from this router."]
当温度不变时，熔体组成的O/Si比高，低聚物（），粘度（）。 ["降低；增加","不变；降低","增加；降低","增加；不变"]
高处作业是怎样分级的？
旅客列车乘务组的主要工作之一是维护车内秩序，保证（）。 ["旅客安全","旅客满意","安全正点","安全可控"]
环境生物学与生态学的主要区别是什么？
