在降雨径流预报过程中，要考虑初损，初损包括哪些？
参考答案：
初损是指开始产流前的损失量，主要是下渗，也包括植物截留.填洼等地面储蓄在内。
— What do you think of the Chinese language today?
— Quite popular. It _____ in communicating with other countries. More and more foreign friends are
learning Chinese. [ ]
A. plays an important role
B. is playing an important role
C. has played an important role
D. is being played an important role
默认情况下，路由器发送IGMP查询消息的间隔是多少（）
A.100秒
B.125秒
C.10秒
D.50秒
