下列不属于OSI参考模型中表示层提供的服务的是【】A．路由选择 B．数据转换 C．

- Did I answer your question correctly?

- ______, but I saw your point.

A．Obviously

B．All right

C．Not exactly

D．Let me see

下列关于城市生态系统能量的表述，哪项是错误的（）

A.来源包括非生物能源

B.能量流动是自发的

C.可以多级利用

D.能量的产生和消费活动会造成环境污染

A．It costs more productivity for companies than actually absenteeism.

B．It can be taken as an indication that there is so much pressure to go to work.

C．The companies have to pay sick employees a great deal to stay home.

D．There might be too many people who stay home when they’re not sick.

简述感受性变化规律。

用50％辛硫磷乳油1000倍液，浇灌防治（）效果最好。