黄连中的抗菌成分是
A．小檗碱B．麻黄碱C．莨菪碱D．吗啡E．乌头碱
参考答案：A
Your grandpas is at hospital. Oh no!_______? [ ]
A. What's wrong with him
B. What is that?
C. It's sounds great?
D. How dangerous!
对流传热系数一般比传导传热系数（）。
