21. The most common form of skeletal malignancy is(A) Chondrosarcoma(B) Osteosarcoma (C) Synovial sarcoma(D) Ewing sarcoma(E) Metastatic tumors

1.Which of the following statements is NOT TRUE for acute respiratory distress syndrome (ARDS)? (A) ARDS is a manifestation of severe acute lung injury (B) The histologic manifestation of ARDS is diffuse alveolar damage (C) The characteristic histologic finding is emphysematous change (D) ARDS is a clinical syndrome of progressive respiratory insufficiency in the setting of sepsis, severe trauma or diffuse pulmonary infection (E) The mort mrtality rates were 35%~46%

21. The most common form of skeletal malignancy is
(A) Chondrosarcoma
(B) Osteosarcoma
(C) Synovial sarcoma
(D) Ewing sarcoma
(E) Metastatic tumors

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