线性结构中元素之间存在（）关系，树形结构中元素之间存在（）关系，图形结构中元素之间存在（）关系。
参考答案：一对一 一对多 多对多
Look! He wears a blue jacket and looks very ______today. [ ]
A. good
B. well
C. smart
D. strong
差压流量计一般要进行温度压力补偿。
Look! He wears a blue jacket and looks very ______today. [ ]