更多“在工作中，操作者不得用手或脚直接清除锻件上的氧化皮或推传工件”相关的问题
萃取剂的选择最重要的依据是价格低廉、来源广泛。
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用人单位申报后，因采用的生产技术、工艺、材料等变更导致所申报的职业病危害因素及其相关内容发生改变的，应当在变更后()日内向原申报机关申报变更内容；用人单位终止生产经营时，应当向原申报机关办理申报注销手续。
A.10
B.20
C.25
D.30
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COOKTEK三合一外送箱清洁频率以下描述正确的是（）
A.每日
B.每周
C.每两周
D.每月
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货运合同收货人()。
A、可以是托运人
B、在知道货物运输到达后，应当及时提货
C、逾期提货的，应当先由托运人向承运人支付保管等费用
D、逾期提货的，托运人与收货人为一人时，由收货人承担支付保管费的责任
E、在提货时应当按照约定的期限检验货物
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患者，男，70岁。因经常夜间睡眠时离床到院子里活动，醒后对所发生的事情不能回忆，诊断为梦游症。该患者梦游所处睡眠分期的特点是（）
A．睡眠最浅
B．易被唤醒
C．难以唤醒
D．很难唤醒
E．极难唤醒
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项目风险管理中最重要的步骤是( )。
A．定量风险分析B．风险监测与控制C．风险识别D．定性风险分析
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混凝土立方体抗压强度试验标准试件尺寸是( )。
A. 150×150×300 B. 150×150×150 C. 200×200×400 D. 100 ×100 ×100
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下列哪些并发症不可能发生于骨折晚期？（ ）
A.骨化性肌炎 B.骨缺血性坏死 C.创伤性关节炎 D.关节僵硬 E.休克
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The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of light, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights. The difficulty is predicting how electromagnetic fields might affect an aircraft’’s computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not. The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that terrorists may use radio system in order to damage navigation equipment. As worrying, though, is the passenger who can’’t hear the instructions to turn off his radio because the music’’s too loud.
A．they don’t believe there is such a danger as radio interferenceB．the harmful effect of electromagnetic interference is yet to be provedC．most passengers refuse to take a plane which bans the use of radio and cassette playersD．they have other effective safety measures to fall back on
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Which of the following is Not True?A． Advertisement makes contribution to our pockets and we may know everything.B． We can buy what we want.C． Products of good quality don't need to be advertised.D． Advertisement makes our life colorful.
A.B．B.C．C.D．
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婴幼儿最理想的钙来源是（） |食物中蛋白质含量最高的是（）
A.大豆
B.乳及乳制品
C.肉类
D.蛋类
E.粮谷
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下列选项中不属于课程标准基本理念的是（）
A.提升信息素养，培养信息时代的合格公民
B.培养学生电脑技能，适应未来工作需要
C.强调问题解决，倡导运用信息技术进行创新实践
D.关照全体学生，建设有特色的信息技术课程
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