// 创建全局并行
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, dispatch_queue_t queue = dispatch_ge
阅读背景：
GCD实战之多个网络请求的并发
来源：互联网
// 创建全局并行
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, dispatch_queue_t queue = dispatch_ge
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