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Update 最重要的JVM参数指南.md

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2.3 显式的式，成了显示的示。
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@ -67,7 +67,7 @@ GC 调优策略中很重要的一条经验总结是这样说的：
-XX:NewRatio=1
```
### 2.3.显示指定永久代/元空间的大小
### 2.3.显式指定永久代/元空间的大小
**从Java 8开始，如果我们没有指定 Metaspace 的大小，随着更多类的创建，虚拟机会耗尽所有可用的系统内存（永久代并不会出现这种情况）。**