下面哪种植物在转基因植物基因流研究中有重要意义()
A.大葱
B.萝卜
C.甘蓝型油菜
D.韭菜
参考答案:C
填空。
1. we are _____ at Wang Lin's long yellow hair.
2. After the long walk, the children are very _____.
3. I like dolphins because they're very _____.
4. The boy is _____. He wants to be a basketball player when he
grows up (长大).
下列项目方案类型中,适于采用净现值法直接进行方案选优的是:()
A.寿命期相同的独立方案
B.寿命期不同的独立方案
C.寿命期相同的互斥方案
D.寿命期不同的互斥方案