决策表中的()的作用是给出问题规定的可能采取的操作。
A、条件桩
B、条件项
C、动作桩
D、动作项
参考答案:C
I'm hungry now. Let's stop _____.[ ]
A. having a meal
B. having a rest
C. to have a meal
D. to have a rest
什么是植物种内竞争所表现的密度效应?