广告中可以含有下列什么情形（） ["中华人民共和国国旗","中华人民共和国国徽","中华人民共和国国名","中华人民共和国国歌"]
碱一般用于淀粉浆料的退浆，其退浆率一般在（） ["50%-70%","60%～80%","90%","90～98%"]
观察对下图的叙述，正确的是（） ["具B骨骼的动物盲肠退化","具A骨骼的动物小肠相对身长较长","具B骨骼的动物是植食动物","具A骨骼的动物是肉食动物"]
Which step should be taken，if possible，when the vessel must be abandoned because of a distress situation（）. ["Alert the Coast Guard by using the survival craft's portable INMARSAT unit","Program the SART and EPIRB to transmit the vessel's location and situation","Place the SART and EPIRB in the“ON”position and secure them to the survival craft","No additional steps are needed as the SART and EPIRB will both automatically float free and operate properly"]
用户引入管进入密闭室内空间时，密闭室必须改造，设置换气口，且通风换气次数每小时不得小于（）次。 ["1","2","3","4"]
到达角度
