该电路是指由一个电源，这就是为什么没有变压器，整流器，或者过滤器供电电容的示意图。

The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic.

youdao

一个只包含数据类型而不包含uri的意图对象匹配成功，仅仅当过滤器中含有相同的数据类型而没有指定uri。

An Intent object that contains a data type but not a URI passes the test only if the filter lists the same data type and similarly does not specify a URI.

youdao