下列关于物体的内能与做功、热传递关系的叙述,正确的是()
A. 对物体做功,物体内能一定增加
B. 向物体传递热量,物体内能一定增加
C. 必须同时对物体做功和传递热量,物体内能才能增加
D. 对物体做功,并向物体传递热量,物体内能一定增加
查看答案
What is the author's attitude towards Cairo?
A. Positive.
B. Negative.
C. Objective.
D. Not clear.
A(n) __________ shape has four straight sides at go to each other, two of which are much longer than the other two.
A. square
B. oval
C. circular
D. oblong
With regard to job opportunities for young graduates, the author sounds
A. pessimistic.
B. hopeful.
C. indifferent.
D. furious.
When Linda heard the good news she tried to sound casual, but her excitement was obvious.
A. uncaring
B. disinterested
C. without plan
D. without warning