什么是B类放大器？
B. Class B's constructor has no arguments.
类b的构造函数没有参数。
Suppose you have a derived class D whose base class B has implemented some interfaces.
假设有个类型D，它的基类B实现了某些接口。
B: What class are you trying to take?
你想要上哪门课？
B: Yes, he is running for class President.
是的，他要竞选班长。
B: One class is on Tuesday and Thursday from 2:00 - 4:00 p.m.
一个班是周二和周四下午两点到四点。
b音乐课？
B: That class is from ten to twelve on Monday and Wednesday.
另一个是周一和周三早上十点到十二点。
是的，头等舱。
B: Sure. Join my class next week.
那当然。下周来我们班吧。
Replacement of a/b/file1.class under MyBusinessLogic.jar.
替换 MyBusinessLogic.jar下的a/b/file1.class 文件。
B. The woman didn't go to English class.
女士没有去上英文课。
Features:The insulation class is B; the protective class is IP44.
特点：绝缘等级为B级，外壳防护等级为IP44。
Features:The insulation class is B; the protective class is IP44.
特点：绝缘等级为B级，外壳防护等级为IP44。
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