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This helps the subclass get rid of the entanglement of repeated invariant behaviors.韩信和蒯彻全都将信将疑，关于传国玉玺，确实是自从项羽死后就没有消息了。太后的意思就是皇帝的意思。板栗点头，看着两边枯黄的山坡，眼前波光粼粼的水面，静静晒着冬日暖阳，身后山塘却传来一片喧嚣，动静之间，别有意趣。(4) The registered fire engineer to which he belongs practices in more than two social organizations at the same time;Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.Pool.remove (conn);