钢筋混凝土基础内受力钢筋的数量通过设计确定，但钢筋直径不小于（）
A.6mm
B.8mm
C.4mm
D.10mm
参考答案：B
15. A world-famous ballet company’s 42-year absence from Beijing will end it brings a new production to the stage this week.
A．since
B．when
C．unless
D．until
骨端粗大，四肢变短
A．骨关节炎B．类风湿关节炎C．血友病性关节炎D．大骨节病
