纤维素性心包炎
参考答案:
是急性心包炎的初期阶段,心包脏层和壁层充血,肿胀,有纤维蛋白、白细胞及少许内皮细胞渗出,造成心内膜不光滑,主要临床表现为心前区疼痛及心包摩擦音。
简述脑干对痛觉调制的基本理论(即两个系统)。
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