不成对的脑颅骨是 ( )
A.顶骨
B.下鼻甲骨
C.下颌骨
D.颞骨
E.筛骨
参考答案:E
Before driving into the city, you are required to get your car ____.
A.washed
B.wash
C.washing
D.to wash
氧化铁(Fe2O3).氧化亚铁(FeO).四氧化三铁(Fe3O4)中氧元素质量相等,则这三种物质的质量比为( )
A.2:1:3
B.5:2:7
C.30:27:58
D.80:108:87