巨大帽状腱膜下血肿处理原则()
A.热敷
B.冷敷
C.预防感染
D.加压包扎
E.抽吸引流
参考答案:D
解析:巨大头皮血肿需4~6周才能吸收,为防止感染,一般不采用抽吸。
It has been proved _________eating vegetables in childhood helps to protect you against serious illnesses in later life. [ ]
A. if
B. because
C. when
D. that
如图所示,顶端粗糙的小车,放在光滑的水平地面上,具有一定速度的小木块由小车左端滑上小车,当木块与小车相对静止时,木块相对小车的位移为d,小车相对于地面的位移为x,求整个过程中动能的变化量。