《客车运用限度表》中规定，踏面擦伤及局部凹入深度外属出库≤（）mm。
A.0.5
B.1
C.1.5
D.2
参考答案：B
______ they are twin sisters, they don't look like each other. [ ]
A. Because
B. Since
C. Though
D. However
下列样品中可以用巴布科克法测定脂肪含量的有（）。
A、甜炼乳
B、鲜乳
C、奶油
D、肉类
