小剂量多巴胺[10μg/(min·kg)]的作用不包括
A.收缩肠系膜动脉
B.加强心肌收缩力
C.兴奋β1和多巴胺受体
D.增加心排血量
E.扩张肾动脉
参考答案:A
看图完成短文。
I h a bear and a monkey. The bear's hair is l than the monkey's. But the bear's eyes are s than the
monkey's. My brother h an elephant. The elephant is f and h than the monkey. The monkey is t than the bear, too. We all l our toys.
澳大利亚在几千万年前就与其它大陆分离,加上当地自然条件比较单一,使得动物的演化十分缓慢。下列不属于澳大利亚独有的动物是
A.鸭嘴兽
B.鸸鹋
C.斑马
D.袋鼠