金属烤瓷材料与金属的结合形式中，（）起着最大的作用。
参考答案：化学结合
It was March 3 . 2011 _____ a magnitude 9.0 earthquake struck Japan and subsequent tsunami
started the large-scale crisis. [ ]
A. that
B. When
C. on which
D. which
能清热化痰，又能润肺止咳，尤宜于虚劳燥咳的药物是( )
A．桔梗B．浙贝母C．川贝母D．天竺黄E．前胡
gnitude 9.0 earthquake struck Japan and subsequent tsunami