《动车组列车服务质量规范》从事餐饮服务的人员有卫生知识培训合格证明。
渗透系数。
Which two of these statements correctly describe classic PIM-SM？（） ["The IOS default is for a last-hop router to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.","The IOS default is for every one of the routers on the shared tree to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.","The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "infinity."","The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "zero.""]
《动车组列车服务质量规范》广播员有一定编写水平，经过广播业务、技术培训合格。
国际贷款
在课堂教学中，教师的非言语表达艺术是非常丰富的，它一般要通过（）、手势、（）、眼神、体态等来表达。
