适筋梁正截面受力过程中,当受拉区混凝土开裂的瞬间,下列哪项叙述是正确的()
A.钢筋达到屈服
B.钢筋应力突增
C.钢筋应力突增
D.混凝土到抗压强
参考答案:B
---He didn’t go to the concert yesterday, did he?
---_______, he was studying for the tests all day.
A.No, he didn’t
B.Yes, he did
C.No, he did
D.Yes, he didn’t
营销渠道是商品从生产者向销售商转移的路径与通道。