第11题: [单项选择]性联无丙种球蛋白血症患者出现临床症状的时间为() A. 生后1个月内 B. 生后3~5个月内 C. 生后6~9个月内 D. 学龄前 E. 青少年期 参考答案:C 答案解析:该病为先天性B细胞免疫缺陷,为X-连锁隐性遗传。女性为携带者,男性发病。婴儿常在出生后6~9个月发病,此前从母体获IgG类抗体已降解与消耗完,因而出现反复化脓性细菌感染,解决办法只能暂时性、定期注射I
第14题: [单项选择]Before welding can be done in a tank that has carried petroleum products,a certificate must be obtained from(). A. the Customs B. the Register Bureau of Shipping C. the Shipyard Fire Department D. a certified gas chemist 参考答案:D