钢筋在加工过程中若发生______、______或______明显不正常等现象，应进行专项检验。
参考答案：弯曲处裂缝；焊接性能不良；力学性能
软骨内化骨
A．直接缝合皮肤B．凡士林纱布覆盖包扎C．中厚游离皮片移植D．邻指带蒂皮瓣E．腹股沟轴型皮瓣
Harry ______ Helen with her lessons at this time yesterday. [ ]
A. is helping
B. helps
C. was helping
D. helped
