合金结构钢牌号16MnR中，“Mn”表示( )。

A．锰的质量分数的平均值等于0.16%

B．锰的质量分数的平均值小于0.16%

C．锰的质量分数的平均值小于0.5%

D．锰的质量分数的平均值小于1.5%

The towing light is a(n)（）.

A.flashing amber light

B.yellow light with the same characteristics as the sternlight

C.all-round yellow light

D.yellow light with the same characteristics as the masthead light