化学吸收与物理吸收的本质区别是什么？化学吸收有何特点？
参考答案：
溶质是否与液相组分发生化学反应
高的选择性；较高的吸收速率；降低平衡浓度ye
Leaders of the BRIC countries-----Brazil, Russia, India and China----_______their second summit on Friday. President Hu Jintao then returned home to help direct relief work ______the deadly earthquake in Qinhai.
A．left, to follow
B．concluded, following
C．had left, following
D．had concluded, followed
南亚气候的显著特征是（ ）
A．全年高温多雨
B．全年高温少雨
C．一年分热、雨、凉三季
D．一年分冷、热、雨三季
