腹主动脉发出哪些脏支
参考答案:答:成对的脏支有肾上腺中动脉、肾动脉和睾丸动脉(男)或卵巢动脉(女) (2分);不成对的脏支 有腹腔干、肠系膜上动脉和肠系膜下动脉(3分)。
一个正四棱柱的各个顶点在一个直径为4cm的球面上.如果正四棱柱的底面边长为2cm,那么该棱柱的表面积为______cm2.
There _____lots of fish in this river, and birds catch ______for food. [ ]
A. are, them
B. are , it
C. is, it
D. is , them