期盼正义，维护正义是所有善良人的心声。下列与正义行为相符的是[ ]
A．抄袭他人作业
B．欺负弱小同学
C．哄抬食盐价格
D．遵守变通规则
答案：D
下列加点字字义相同的一项是
A．阅历历历在目
B．筹备略胜一筹
C．故意依然如故
D．安稳安然无恙
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) .
（50）是（）
A.rate
B.velocity
C.bandwidth
D.period
