【简答题】由( )植物体上切取下来的,用于( )的各种接种材料。包括( )、组织、细胞或原生质体等叫做( )
【判断题】生物质能的优点是燃烧容易、污染少、热效率高。
【判断题】生物质能的优点在于其环保性、低成本、可再生和安全性。
【单选题】Aftrer surgical operation of bone fracture of the leg which is with a plaster immobilization for a long time, the leg muscle becomes thin and presents as atrophy. The atrophy majorly belongs to ( )
【单选题】Lack of meteorological and tidal research means, researchers have to depend on
A.
measuring the output of coconut.
B.
observing the erosion of foreshores.
C.
collecting short interesting accounts concerning climate.
D.
computer model on climate changes.
【单选题】由活体植物上切取下来的,用于组织培养的各种接种材料是