【单选题】Biology is the study of ____.
【单选题】Biology is the study of living things. Which characteristic applies to all forms of life?
A.
able to move from place to place
C.
carry out photosynthesis
D.
possess a nervous system
【判断题】Molecular biology is the study of the different types of cells and how they work.
【判断题】Cellular biology is the study of the different types of cells and how they work.
【单选题】无向图的邻接矩阵是一个( ),有向图的邻接矩阵是一个( )
【单选题】关于结核菌素PPD试验下列操作不正确的是
E.
测局部硬结范围,取纵、横两者平均直径判断强度