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判定“带头结点的链队列为空”的条件是（）。
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The days of elderly women doing nothing but cooking huge meals on holidays are gone. Enter the Red Hat Society--a group holding the belief that old ladies should have fun."My grandmothers didn’ t do anything but keep house and serve everybody. They were programmed to do that," said Emily Cornette, head of a chapter of the 7-year-old Red Hat Society.While men have long spent their time fishing and playing golf, women have sometimes seemed to become unnoticed as they age. But the generation now turning 50 is the baby boomers(生育高峰期出生的人), and the same people who refused their parents’ way of being young are now trying a new way of growing old.If you take into consideration feminism(女权主义), a bit of spare money, and better health for most elderly, the Red Hat Society looks almost inevitable(必然的). In this society, women over 50 wear red hats and purple(紫色的) clothes, while the women under 50 wear pink hats and light purple clothing."The organization took the idea from a poem by Jenny Joseph that begins: When I am an old woman, I shall wear purple. With a red hat which doesn’ t go," said Ellen Cooper, who founded the Red Hat Society in 1998. When the ladies started to wear the red hats, they attracted lots of attention."The point of this is that we need a rest from always doing something for someone else," Cooper said, "Women feel so ashamed and sorry when they do something for themselves. " This is why chapters are discouraged from raising money or doing anything useful. "We’ re a ladies’ play group. It couldn’ t be more simple," added Cooper’ s assistant Joe Heywood. Women join the Red Hat Society because（）
某项目，需要采购价值280万元的设备，该采购项目属于政府采购项目，招标代理机构向业主提出可以采用公开招标或竞争性谈判进行采购。业主选择了采用竞争性谈判方式进行采购。 问题 在什么情况下业主可以选择竞争性谈判方式
某省重点工程项目计划于2009年12月28日开工，由于工程复杂，技术难度高，一般施工队伍难以胜任，业主自行决定采取邀请招标方式。在2008年9月8日业主向通过资格预审的A、B、C、D、E五家施工承包企业发出了投标邀请书。该五家企业均接受了邀请，并于规定时间9月20日～9月22日购买了招标文件。招标文件中规定，10月18日下午4时是招标文件规定的投标截止时间，11月10日发出中标通知书。 在投标截止时间前，A、B、D、E四家企业提交了投标文件，但C企业于10月18日下午5日才送达，原因是路途堵车。10月21日下午由当地招标投标监督管理办公室主持进行了公开开标。评标时发现E企业投标文件虽无法定代表人签字和委托人授权书，但投标文件均已有项目经理签字并加盖了单位公章。 问题 业主白行决定采取邀请招标方式的做法是否妥当说明理由。
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