梁下部纵向受力钢筋接头位置宜设置在（）。
A.梁跨中1/3处
B.梁支座处
C.距梁支座1/3处
D.可随意设置
参考答案：C
检查肝细胞癌的病灶内血流，用哪一项彩色多普勒技术最简便有效（）。
A.M型彩色多普勒
B.彩色多普勒血流成像
C.频谱多普勒
D.彩色多普勒能量图与超声造影并用
E.以上都不是
A study has found that 80% of the people who ______ to be constantly distracted ______ more “working memory”.
A．appears; have
B．appear; has
C．appears; has
D．appear; have
