目前,国内外测定沥青蜡含量的方法很多,但我国标准规定的是( )
A.硫酸法
B.组分分析法
C.化学分析法
D.蒸馏法
参考答案:D
It was pretty _______ from her voice that she was playing a trick on all of us.
A.curious
B.obvious
C.religious
D.energetic
3条或3条以上的发育沟相交所形成的凹陷称为
A.窝
B.点隙
C.外展隙
D.楔状隙
E.邻间隙