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扫描身份证，查询参保信息，打印参保证明……在河北三河市政务服务燕郊中心，市民王先生用了不到1分钟，就在自助服务终端机上打印好北京参保证明。，详情可参考safew官方版本下载
Besides, US oil firms have been bitten by Venezuela once before. In 2007, major US companies including ExxonMobil and ConocoPhillips had their assets seized when they refused to allow PDVSA to take majority control.，详情可参考爱思助手下载最新版本
// 栈不为空时才判断（避免访问stack.at(-1)时报错）