大部分兰花培养过程中会经过（）A、器官型B、胚胎发生型C、原球茎D、无菌断枝型

单项选择题As for Jing and Chou, the pattern is in accordance with the disposition of the characters according to the rule of facial make-up in Beijing Opera. _______ for stubborn, irritable , and not easily controlled characters. A、 White B、 Green C、 Yellow D、 Black

单项选择题在工程热力学中，热与功之间的转换常常是通过气体的( )变化来实现的。