在螺栓联接中,有时在一个螺栓上采用双螺母,其目的是 A.
提高强度 B.
提高刚度 C.
防松 D.
减小每圈螺纹牙上的受力

单项选择题He could not himself any longer from losing his temper when he learned that his teenage son had skipped class again. A、assume B、 yield C、abandon D、 restrain

单项选择题规范中限制配筋强度比值系数的范围在0.6-1.7之间的原因是( )