下列过程中，（）能使烧结产物强度增大而不产生致密化过程。（）
A、蒸发－凝聚
B、体积扩散
C、粘性（塑性）扩散
D、表面扩散
参考答案：A, D
图中能正确表示北半球近地面风向与等压线关系的是
[ ]
A、A
B、B
C、C
D、D
President Hu Jintao urged that every effort to rescue and treat the injured when the earthquake happened in Sichuan this year．
A．is made
B．must be made
C．should make
D．be made
