擅自发行股票债券罪属于（） 。 ["非法从事金融业务罪","伪造货币罪","伪造证券罪","金融诈骗罪"]
从亲和沉淀的机理和分离操作的角度出发，简述亲和沉淀纯化技术的优点。
Which two network attack statements are true？（） ["Access attacks can consist of password attacks，trust exploitation，port redirection，and man-in-the-middle attacks.","Access attacks can consist of UDP and TCP SYN flooding，ICMP echo-request floods，and ICMP directed broadcasts.","DoS attacks can be reduced through the use of access control configuration，encryption，and RFC 2827 filtering.","DoS attacks can consist of IP spoofing and DDoS attacks.","IP spoofing can be reduced through the use of policy-based routing.","IP spoofing exploits known vulnerabilities in authentication services， FTP services，and web services to gain entry to web accounts，confidential databases，and other sensitive information."]
如果流动资产大于流动负债，则与此相对应的差额要以长期负债或股东权益的一定份额为其资本来源。（）
填隙物
什么是初级承诺和高级承诺？
