静注等效剂量时，下列哪种药物对心肌收缩性抑制作用最强（）
A.丙泊酚
B.硫喷妥钠
C.依托咪酯
D.氯胺酮
E.羟丁酸钠
参考答案：B
论述刘勰艺术想象论的主要内容。
Nowadays, many people walk to work ________ Copenhagen Conference calling for living a low-carbon lifestyle to deal with global warming.
A．in relation to
B．in response to
C．in addition to
D．in opposition to
