内能的重要应用:一是可以用它______,二是可以用它______.
内能的重要应用是:加热物体和做功;
故答案为:加热物体;做功.
What the doctor warned us is that the _____ sleep may cause anger,poor memory and poor
concentration. [ ]
A. want in
B. plenty of
C. lack in
D. lack of
脾的()较锐薄,有2~3个凹陷,称()。