白豆蔻、肉豆蔻的共同功效是()
A.温中行气
B.涩肠止泻
C.化湿行气
D.温中止呕
E.温肾助阳
参考答案:A
Where is the post office? It's on _____ Avenue. [ ]
A. the ninth
B. Nine
C. Ninth
某电阻元件的电阻值R=1kΩ,额定功率PN=2.5W,正常使用时允许流过的最大电流为()。
A.2.5A
B.250mA
C.50mA
D.25mA