焊缝咬边属于( )检验的范围。
A．无损检验
B．表面质量检验
C．射线检验
D．超声波检验
参考答案：B
同学们进行跳绳比赛，每组4人，有5组，一共多少人？正确的列式是[ ]
A．4×5
B．4+5
C．5+5
After they had each said a few words, _____ Lloyd George took the floor.
A．and
B．so
C．or
D．不填
