切面韧皮部有红棕色至黑棕色分泌物,与木质部相间排列,呈数个同心型椭圆形环或偏心性半圆形环的药材是()
A.鸡血藤
B.大血藤
C.降香
D.苏木
E.川木通
参考答案:A
For several weeks she had been training me to play chess(棋) with her, so I suggested
a game and she eagerly . [ ]
A. allowed
B. expected
C. replied
D. accepted
作航行指示灯的灯泡中可发出红色的光,是在灯泡中加入了()
A.氦气
B.氖气
C.氩气
D.氪气