液体体积随压力变化而改变。在一定温度下，每增加一个单位压力，液体体积的相对变化值，称为液体的压缩性。
参考答案：对
His conduct at the conference is regarded as being _____ unacceptable. [ ]
A. notably
B. firmly
C. seriously
D. totally
用所给词的适当形式填空
1. —What ______ (happen) to Jim last night?
—He fell down and hurt his leg.
2. By the time he got to school, classes______ already ______ ( start).
3. I ______( work) out five math problems by the time the teacher came in.
4. When I got up this morning, my brother ______( got) into the bathroom.
5. By the end of last term, we ______(learn)many English words.
