()和杂交育种都是小麦最常用的育种方法。
A、诱变育种、引种
B、系统选种、辐射育种
C、引种、系统选种
D、单倍体育种、诱变育种
参考答案:C
中性温度是指()
A.肛温
B.腋温
C.皮温
D.环境温度
E.体温
()is not the advantage of GERT (graphical evaluation and review techniques) as compared with PERT (project evaluation and review techniques).
A.Allowing looping
B.Allowing for dummy tasks
C.Allowing branching
D.Allowing multiple project end results