脓胸渗出期的病理变化为()
A.脏层和壁层胸膜充血
B.渗出液稀薄
C.细胞成分少
D.胸穿抽脓较易
E.排出渗液后肺不易复张
参考答案:A, B, C, D
Last year many well-known singers did everything _______ help the people in the tsunami-hit countries.
A.she could do
B.she could to
C.that she could do
D.that she could
用人单位应当依法为职工办理工伤保险,让职工缴纳工伤保险费。()