在下列成对的理论中,属于唯物主义和唯心主义的对立的是
A.能动反映论和机械反映论的对立
B.宿命论和唯意志论的对立
C.反映论和先验论的对立
D.可知论和不可知论的对立
参考答案:C
某侧面直角角焊缝hf=4mm,由计算得到该焊缝所需计算长度为50mm,考虑起落弧缺陷,设计时该焊缝实际长度取为( )
A.50mm B.58mmC.60mm D.40mm
A bond was purchased exactly one year ago for $910 and was sold today for $1020. During the year, the bond made two semi - annual coupon payments of $ 30. What is the holding period return()
A. 6.0%.
B. 12.1%.
C. 18.7%.