What is the meaning of the load in“Load Decrease”（）
A. resistance
B. voltage
C. power
D. potential
Given that i = 100 sin（314 t － 30°）A, u = 311sin（314 t + 60°）VFind the phase difference between u and i（）
A. – 90°
B. 30°
C. – 30°
D. 90°
As medical knowledge__, people’s beliefs change（）
A. involves
B. evolves
C. resolves
D. dissolves
芦荟的功效是（）
A. 泻下、攻积、杀虫
B. 泻下、软坚、清热
C. 泻下、解毒、活血
D. 泻下、清肝、杀虫
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