正常胞浆内可含有脂褐素的细胞是：
A．肝细胞B．附睾和睾丸间质细胞C．肾上腺网状带细胞D．肾小管上皮细胞E．心肌细胞
参考答案：B
已知b＜a＜0＜c，化简|a|-|b+a|+|c-b|-|a-c|．
Which of the following signs and symptoms is classic for a patient with rheumatoid arthritis
A．Joint swelling, joint stiffness in the morning, and bilateral joint involvement.
B．Crepitus, development of Heberden's nodes, and anemia.
C．Pain on weight-bearing, rash, and low-grade fever.
D．Fatigue, leukopenia, and joint pain.
