3月7日下午，@广铁集团广九客运段发布关于G3046次车内冒烟的情况说明显示，冒烟原因系一名乘客的手机被转动座椅挤压后，屏幕碎裂所致。
When we define our interfaces in C# 4.0, we are allowed to mark each of the generic parameters as in or out. If we try to set a generic parameter as out and that\'d lead to a problem, the compiler rai
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