以下不属于焰熔法合成尖晶石内含物的是（） ["气泡","弧形生长纹","助熔剂残余物","氧化铝残渣"]
Which statement is true about the components of a queuing mechanism？（） ["Each subinterface has its own hardware queue and can experience congestion just like its main interface","Hardware queuing is only used if the software queues are experiencing congestion.","Hardware queues and software queues are not used concurrently.","The hardware queuing system always uses the FIFO queuing mechanism."]
完全由教师预设的活动是“高结构活动”。
秦汉时期，主要通过考察（）来奖赏二十等军功爵。 ["武艺","道德素质","文字","个人素质"]
下列说法哪些是正确的？（） ["只能对发明专利给予实施专利的强制许可","只有发明专利申请才需要进行保密审查","只能对实用新型专利作出专利权评价报告","只有发明专利才能由国务院批准推广应用"]
通常，群落的多层结构可分为3个基本层，即（）、灌木层、草本和地被层。
