在下列哪项情况下，梁斜截面宜设置弯起钢筋（）。
A.10mm
B.15mm
C.20mm
D.25mm
参考答案：B
The room ______ 10 metres across is large enough for a single man to live in．
A．measuring
B．measures
C．to be measured
D．measured
学习动机分为内部动机和外部动机。
