阳光的热辐射使油罐中的气体空间和油温明显升高。
参考答案：对
— What _____ to the little baby a moment ago?
— He fell off the bed. [ ]
A. happens
B. happened
C. was happened
D. is happening
直线组合检波的形式能抑制（）方向的干扰。
A.沿测线
B.垂直测线
C.平行测线
D.多
