Irradiating Food Irradiating fruits, vegetables, pork and chicken to kill insects and bacteria has been approved by the Food and Drug Administration over the past decade or so. Irradiation of other meats, such as beef and lamb, is being reviewed. Federal approval does not require that industry adopt the process, and few food processors presently offer irradiated products. Market studies have shown that many consumers are afraid that eating irradiated foods may cause cancer, despite scientific studies that prove the safety of treated foods. Some people argue that more severe government inspection, higher food-safety standard and more careful-preparation practices by consumers are all that is needed to ensure that [单项选择]肾细胞癌肉眼上呈()
A. 灰白色 B. 暗红色 C. 黄白色 D. 鱼肉状 [单项选择]高尚医学道德对医学科学研究工作的重要意义,下列错误的是
A. 是促进医学科学发展的动力 B. 能保证医学科研的正确方向 C. 是评价医学科研成果的重要标准 D. 可为科研人员带来丰厚的经济效益 E. 是营造优良科研环境、保证科研任务完成的重要条件 [单选题]焊接接头拉伸面上的塑性可以通过( )来检验。
A.硬度试验 B.冲击试验 C.弯曲试验 D.金相试验 [单选题]作为一种特殊商品,图书是塑造人类灵魂和教育人民的工具,因而是无价的,不能参与市场竞争,其定价只能按成本、发行费用和微利来折算,并实行全国统一定价。所谓放开书价,实际意在上浮,结果会带来很多危害。
上面这段话主要支持了这样一种观点,即( )。
A.因其定价很难确认,所以不能参与市场竞争 B.其定价如任意浮动,会产生极其不良的后果 C.因不能参与市场竞争,所以出版单位不能赢利 D.如果参与市场竞争,就会失去对人类社会的作用 [单选题]缓冲区接头轨缝符合规定要求。接头螺栓扭力矩达到( )N.m.
A.500 B.700 C.700~900 D.700~1100 [单选题]根据设备机柜安装施工工艺要求,一般情况下柜体水平偏差应小于()mm
A.0.5 B.1 C.2 D.3 [单选题]干粉灭火系统灭火剂的喷射时间指干粉灭火剂的( ) 时间。
A.排放 B.喷射 C.有效喷射 D.灭火 [多选题]救生缓降器分为( )和( )两类。
A.一次性 B.重复使用 C.往返式 D.自救式 [判断题] 高处作业平台四周应设置防护栏、挡脚板;临边及洞口四周应设置防护栏杆、警示标志或采取覆盖措施。 ( )
A.正确 B.错误 [填空题]铁路行车有关人员,于接班前须( )
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