常绿藤本类:
参考答案:
常春藤、金银花
一_______ does Tom drink coffee?
一Once a week.
A.How
B.How much
C.how long
D.How often
X线束入射于肢体曝光面积的大小,称为
A.投影
B.视野
C.曝光面积
D.照射野
E.观察野