第8题:[单选题] There is supposed to be a safety ________ which makes it impossible for trains to derail. A. Mechanism B. Machine C. Mechanics D. Machinery 参考答案:A
第14题: [单项选择]WHO提出号召,出生后4~6个月内的婴儿母乳喂养率应达多少以上() A. 50% B. 60% C. 70% D. 80% E. 90% 参考答案:D 答案解析:本题正确答案为D,即80%的婴儿在出生后4~6个月内应给予母乳喂养。婴儿母乳喂养率低下,是影响婴儿营养状况的重要因素,解决的办法是采取各种措施提高母乳喂养率;其目标即是WHO提出的出生4~6个月内婴儿