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【判断题】
在交变应力作用下，考虑构件表面加工质量的表面质量系数总是小于1的A.
正确
B.
错误
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【简答题】男，10天，为足月顺产儿，母乳喂养，家长为预防小儿佝偻病的发生，来医院咨询。医生的下列指导哪项不恰当A、坚持母乳喂养 B、1个月开始添加蛋黄、鱼泥等 C、坚持日光浴 D、2周开始添加鱼肝油 E、适时补充钙剂 小儿有以下哪些表现应考虑有佝偻病的早期表现A、有郝氏沟及肋骨外翻 B、有方颅或乒乓头 C、精神萎靡 D、睡眠不实，多汗，易惊 E、抽搐或手足搐搦 为预防佝偻病的发生，医生应指导家长A、生后4周...
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【单选题】.对于数据：1，7，5，5，3，4，3.下列说法中错误的是（ ）
A.
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B.
这组数据的众数是5和3
C.
这组数据的中位数是4
D.
这组数据的方差是22
【单选题】下列说法中错误的是( )。
A.
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B.
在剧毒的环境中，人们应戴防毒面
C.
尘肺患者会出现恶心、呕吐等症状
D.
尘肺是长期在粉尘较多的场所工作的人容易患的一类职业病
【简答题】The food we eat seems to have profound effects on our health. Although science has made enormous steps in food more fit to eat, it has, at the same time, made many foods unfit to eat. Some rese...
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