经卧床休息、牵引无效者不是腰椎间盘突出症开放手术适应证之一。
参考答案:对
搜查时,不应有被搜查的家属、邻居在场。( )
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) .
(47)是()
A.direct-sequence
B.discrete-sequence
C.duplicate-sequence
D.dedicate-sequence