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多项选择题

关于货币相关知识，下列说法中错误的是（ ）。

A. 金银天然是货币
B. 充当一般等价物的纸币是货币
C. 货币的本质是一般等价物
D. 货币是价值的符号而自身没有价值
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问答题
英译汉Giant cell tumor of bone (GCT) accounts for approximately 5-9% of primary bone tumors and 20% of benign bone tumors. GCT occurs only after the epiphyseal plates have closed. It most commonly presents in patients between the ages of 25 and 40 and has a slight female predominance. GCT can arise in any bone of the skeleton, but is most frequently detected around the knee (50%); it involves the epiphyseal regions of the distal femur and proximal tibia, although it originates in the metaphysis. GCT is a locally aggressive, generally benign lesion; however, 10% are malignant with local spread or metastases, generally to the lungs. The tumor is usually subcortical and related to the fused growth plate of a metaphysis. It thins the cortex, and periosteal reaction is rare in the absence of a pathological fracture. Soft tissue extention may occur in as many as 50% of cases, sometimes crossing the joint via an extracapsular route. Some conditions such as aneurysmal bone cyst, chondroblastoma, and osteosarcoma may resemble GCT on plain-film radiographs and should be considered in the differential diagnosis.
多项选择题
关于凡科快图以下说法中，正确的有：（      ） A.
凡科快图是一款在线图片编辑工具 B.
凡科快图是一款全免费图片编辑工具； C.
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单项选择题
楼板平法识图中,板块编号中XB表示() A.
现浇板 B.
延伸悬挑板 C.
屋面现浇板 D.
悬挑板
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