企业发生的职工教育经费支出，不超过工资薪金总额（）的部分，准予扣除；超过部分，准予在以后纳税年度结转扣除。 ["2%","2.5%","5%","10%"]
Which two of the following statements describe a routed switch port on a multilayer switch？（） ["Layer 2 switching and Layer 3 routing are mutually supported.","The port will not be associated with any VLAN.","The routed switch port supports VLAN subinterfaces.","The routed switch port is used when a switch has only one port per VLAN or subnet.","The routed switch port ensures that STP remains in the forwarding state."]
简述胃泌素的主要生理作用。
皮下注射的目的是（） ["预防接种","局部麻醉用药","注射药量较大的药物","注射刺激性较强的药物","不宜口服给药时采用"]
党员证明信同党员组织关系介绍信有何区别？在什么情况下可以出具党员证明信？
什么是同步？
