图15-7为角钢与钢板连接，角钢肢尖与钢板间的侧面角焊缝焊脚尺寸为（）。
A.5mm
B.6mm
C.8mm
D.9mm
参考答案：B
My MP4 player isn't in my bag. Where _____ I have put it?[ ]
A. can
B. must
C. should
D. would
某地区种植的蔬菜中硝酸盐和亚硝酸盐的含量较高，为降低其含量可使用( )。
A．氮肥 B．钾肥 C．肥 D．钼肥
