《动车组列车服务质量规范》软卧代座车包房内有（）。 ["卧铺套","靠背套","不锈钢果皮盘","保温杯"]
《动车组列车服务质量规范》软卧代座车包房门框上原铺位号牌处有座席号牌。
TBS有一个密度探测仪，对槽体内的物质密度不断的检测，一旦床层的密度达到或超出预先的（），控制器即控制气动阀门（）排料阀，直至床层密度降低到给定值再关闭。 ["设定值","打开","关闭","实际值"]
投掷项目中运动员全身各部分动作的配合原理是什么？
In 802.1s， how is the VLAN to instance mapping represented in the BPDU？（） ["The VLAN to instance mapping is a normal 16-byte field in the MST BPDU.","The VLAN to instance mapping is a normal 12-byte field in the MST BPDU.","The VLAN to instance mapping is a 16-byte MD5 signature field in the MST BPDU.","The VLAN to instance mapping is a 12-byte MD5 signature field in the MST BPDU."]
离合器的故障种类？
