成人最常见的睾丸肿瘤是() ["畸胎瘤","胚胎癌","绒毛膜癌","精原细胞癌","间质细胞肿瘤"]
用活性炭管采集工作场所空气中苯后,若用溶剂解吸,最常用的有机溶剂为() ["CS2<\/sub>","乙醇","CHCl3<\/sub>","甲醇","CH2<\/sub>C12<\/sub>"]
白血病发病情况说法错误的是() ["白血病发病在儿童和青少年的恶性肿瘤中居首位","欧美国家白血病发病率较我国为高","我国多种白血病中以急性粒细胞白血病为多见","急性淋巴细胞白血病发病率成人与儿童接近","我国慢性粒细胞白血病比慢性淋巴细胞白血病多见,而欧美国家则相反"]
儿童观
百分位数
坐姿空间作业范围