神阙是胚胎发育、输精布气、营养胎体的重要部位，为先天之本、生命之源。
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在一个计算机网络中，当连接相同类型，而协议没有差别时，必须选用（）。
A. 网关
B. 网桥
C. 路由器
D. 集线器
试述光电管的简单结构及其光谱特性、伏安特性、光电特性、暗电流的特点。
In which two aspects does hot patching differ from conventional patching?（）
A. It consumes more memory compared with conventional patching.
B. It can be installed and uninstalled via OPatch unlike conventional patching.
C. It takes more time to install or uninstall compared with conventional patching.
D. It does not require down time to apply or remove unlike conventional patching.
E. It is not persistent across instance startup and shutdown unlike conventional patching.
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