经期小腹绵绵作痛,腰部酸胀,经色黯淡,量少,质稀.头晕耳鸣,中医辨证为()
A.气血虚弱
B.肝肾虚损
C.阳虚内寒
D.气滞血瘀
E.寒湿凝滞
参考答案:B
What time ___________?[ ]
A. it is
B. is it
C. does it
试解释农药残留量和安全间隔期?