采用碳钢焊条焊接铸铁与低碳钢接头时，可先在铸铁坡口上堆焊（）mm的隔离层，冷却后再进行装配点焊。
参考答案：4～5
— I rang you at about nine, but there was no reply.
— Oh, that was probably _____I was seeing the doctor.
A．why
B．when
C．what
D．That
引起黄癣的真菌为（）
A.石膏样小孢子菌
B.犬小孢子菌
C.断发毛癣菌
D.许兰毛癣菌
E.铁锈色小孢子菌
