试述等密度离心法及其特点。
盈余管理的主体是（）。 ["公司管理当局","公认会计原则","会计估计","会计方法"]
Which three statements are true about Cisco IOS Firewall？（） ["It can be configured to block Java traffic.","It can be configured to detect and prevent SYN-flooding denial-of-service （DoS） network attacks.","It can only examine network layer and transport layer information.","It can only examine transport layer and application layer information.","The inspection rules can be used to set timeout values for specified protocols.","The ip inspect cbac-name command must be configured in global configuration mode."]
中国外汇交易中心实行（） 。 ["会员制","公司制","集团制","股份制"]
氢气用的瓶阀，出气口螺纹应是内螺纹（）。 ["左旋","右旋","左或右"]
分组教学制
