肾上腺皮质激素中,“球状带细胞分泌,主要是醛固酮”属于() ["性激素","肾上腺素","盐皮质激素","糖皮质激素","去甲肾上腺素"]
流行性乙型脑炎的主要传染源是() ["黑线姬鼠","蚊子","猪","患者","患者和隐性感染者"]
全国浮选占的比例很少,约()%。 ["5","8","10","12"]
细菌性痢疾的主要传播途径是() ["飞沫传播","粪-口传播","血液传播","虫媒传播","垂直传播"]
目前重介选约占所有选煤方法的()%。 ["20","26","32","35"]
一旦发生海上溢油事故,通常应怎样处理?