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6. If the ship is equipped with several horns with a spacing of more than 100m, only one horn shall be used to sound the control and warning signals.免得坏了事，多筹备些药材等物带去，才是正理。4、5分钟后的女人In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:第二就是往绕过西面，向巨鹿城北进发。