第4题: [单项选择]电动吸引器吸痰,错误的是 A. 插管时关闭吸引负压 B. 每次吸痰时间不宜超过15秒 C. 痰未吸净时休息2~3分钟再吸 D. 小儿吸痰吸力要小,一般<40kPa E. 吸痰用物应每周更换1~2次 参考答案:E
第5题: [单项选择]In the United States, Franklin D. Roosevelt was the only president elected more than twice. In 1951, the Twenty-second Amendment to the Constitution was passed to limit a president to ______ terms. A. one B. two C. three D. four 参考答案:B