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【单选题】
[机械设计部分][中职和高职和教师][中] 机床的传动系统中,高速级采用带传动的主要目的A.
能获得较大的传动比
B.
制造和安装方便
C.
传动运转平稳
D.
可传递较大的功率
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【简答题】国家建立食品( )制度,承担食品安全风险监测工作的技术机构应当根据食品安全风险监测计划和监测方案开展监测工作,保证监测数据( ),并按照食品安全风险监测计划和监测方案的要求报送监测数据和分析结果。
【单选题】下列哪项属于分子诊断类产品_____________。
A.
肺炎支原体抗体检测试剂盒(胶体金法)
B.
肺炎支原体 IgM 抗体检测试剂盒
C.
肺炎支原体及肺炎衣原体核酸联合检测试剂盒(荧光 PCR 法)
D.
肺炎支原体培养基
【单选题】A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of r...
A.
It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
B.
In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
C.
Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
D.
Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
E.
The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused.
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