A. extinction B. migration C. destruction D. extraction 参考答案:A 答案解析:[解析] 逻辑关系题:因果。物种数量本已很少,再加上环境恶化和大规模的狩猎,它们面临的应该是物种灭绝的威胁。[A]extinction“灭绝”符合题意。[B]migration“移民”、[C]dest
第31题: [单项选择]Where tanks are arranged for either oil or ballast () must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank. A. a sea water chest B. a change-over chest C. a buffer tank D. a three-way valve 参考答案:B
第37题: [单项选择]委中穴的主治病证是 A. 滞产 B. 痛经 C. 丹毒 D. 呃逆 E. 便秘 参考答案:C 答案解析:次醪穴主治:①月经不调、痛经、带下等妇科病症;②小便不利;③遗精;④疝气;⑤腰骶痛,下肢痿痹。委中穴主治:①腰背痛、下肢痿痹等腰及下肢病证;②腹痛,急性吐泻;③小便不利,遗尿;④丹毒。 [考