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简述气-水联合反冲洗工艺原理

对于雷电活动强烈,接地电阻又难以降低的地区中的10-35kV电网,可以考虑采用()或者()的运行方式,作为线路的防雷手段。

public class MyLogger { private StringBuilder logger = new StringBuuilder(); public void log(String message, String user) { logger.append(message); logger.append(user); } } The programmer must guarantee that a single MyLogger object works properly for a multi-threaded system. How must this code be changed to be thread-safe?()

A. synchronize the log method
B. replace StringBuilder with StringBuffer
C. No change is necessary, the current MyLogger code is already thread-safe.
D. replace StringBuilder with just a String object and use the string concatenation (+=) within the log method

单缓柱塞阀排气口漏风是何原因?

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