题目内容:
问题10 单选(1分)Furthermore, as ()(observe) in several studies, the features of the heat transfer affect the frost structure.
A.observe
B.observed
C.observing
D.been observed
参考答案:
问题10 单选(1分)Furthermore, as ()(observe) in several studies, the features of the heat transfer affect the frost structure.
A.observe
B.observed
C.observing
D.been observed