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【单选题】
A 70-year-old man presents with fever, shaking chills, and shortness of breath. The patient exhibits grunting respirations, 30 to 35 breaths per minute, with flaring of the nares. The sputum is rusty yellow and displays polymorphonuclear leukocytes (neutrophils). The patient is successfully treated with antibiotics. Which of the following inflammatory cells will infiltrate the patient’s respiratory alveoli during the recovery to remove necrotic debris?A.
Basophils
B.
Eosinophils
C.
Lymphocytes
D.
Macrophages
E.
Plasma cells
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【单选题】下列结论中哪些是正确的?( ) (1)平面图形对于其形心轴的静矩和惯性积均为零; (2)平面图形对于其对称轴的静矩和惯性积均为零; (3)平面图形对于不通过形心的轴,其静矩和惯性积均不为零; (4)平面图形对于非对称轴的静矩和惯性积有可能为零。
A.
(1) 、 (3)
B.
(2) 、 (4)
C.
(1) 、 (2) 、 (3)
D.
(2) 、 (3) 、 (4)
【简答题】下列分子中偶极矩不为零的有哪些? CS 2 CO 2 CH 3 Cl H 2 S SO 2