α、β受体激动药
A．酚妥拉明B．肾上腺素C．阿替洛尔D．拉贝洛尔E．普萘洛尔
参考答案：B
If the cat__________ the sparrow, it __________into the pond. [ ]
A. hadn't teased; would not have fallen
B. hasn't teased; would not have fallen
C. hadn't teased; did not fall
D. hadn't teased, won't have fallen
循环水车间的开工操作
