【简答题】期权价值包括______价值和______价值。
【单选题】Nowadays the application of computer is mainly ( ).
A.
scientific computation
【单选题】下列关于种群的正确叙述是 ①内蒙古草原上全部的牛是一个种群 ②种群内的雌雄个体间可以相互交配完成生殖过程 ③在种群内常因争夺食物而发生竞争和捕食 ④年龄组成是预测种群密度的重要因素 ⑤性别比例也可影响种群密度 ⑥出生率和死亡率是决定种群密度的重要因素 ⑦迁出率和迁入率是决定种群密度的重要因素 [ ]
【单选题】Nowadays we mainly program for PLC by ______.
A.
the special-purpose programming terminals
B.
the programming panels
C.
the personal computers connected to the PLC
D.
. the programming unit
【简答题】Nowadays, the mainly used database model by many DBMS, such as Access, SQLSever, MySQL, is .
【单选题】Nowadays we mainly program for PLC by ____.
A.
The special-purpose programming terminals
B.
The programming panels
C.
The personal computers connected to the PLC
【简答题】使用价值是交换价值的(),交换价值是价值的(),价值是交换价值的()。