叶表面有腺鳞,非腺毛,气孔直轴式的药材是
A.广藿香
B.薄荷
C.荆芥
D.穿心莲
E.益母草
参考答案:A,B,C,D,E
电流用字母______表示,在国际单位制中,电流的单位是______,用字母______表示.
— I wonder ________ you’ll water this kind of flower.
——Every other day.
A.how often
B.how long
C.how soon
D.how much