太阳直径为1390000千米，用科学记数法表示为______千米．
1390000=1.39×106．
故答案为1.39×106．
—I didn’t mean ______ my mother.
—But talking to her like that meant ______ her.
A．hurting; hurting
B．to hurt; hurting
C．hurting; to hurt
D．to hurt; to hurt
（）用来检测两个结合面之间的间隙大小.
