从活动水平的角度看，个体的实践活动由生理、__________和__________三种不同层次和内容的活动构成。
参考答案：心理 社会
Spread spectrum simply means that data is sent in small pieces Over a number of the (46) frequencies available for use at any time in the specified range. Devices using (47) spread spectrum (DSSS) communicate by (48) each byte of data into several parts and sending them concurrently on different (49) . DSSS uses a lot of the available (50) , about 22 megahertz (MHz) .
A．splitting
B．combining
C．packing
D．compacting
清创缝合处理的伤口3~5天后，患者高热，伤口处肿胀、发红、剧痛，此时宜（）
A.继续观察
B.加大抗生素的剂量
C.局部理
D.及时拆除缝线，引流
E.伤口内注射抗生素
