首页 > 分享 > 植物农药又称生物农药,是利用有毒植物中的多种杀虫成分,经过提炼后生产的

植物农药又称生物农药,是利用有毒植物中的多种杀虫成分,经过提炼后生产的

[单项选择]

植物农药又称生物农药,是利用有毒植物中的多种杀虫成分,经过提炼后生产的农药,由于它们的杀虫有效成份为天然物质,因而施用后较易分解为无毒物质,对环境无污染。
下列对“植物农药”概述正确的一项是()。


A. 是提炼有毒植物中能有效杀虫的对环境无污染的无毒物质制造的
B. 是提炼有毒植物中多种杀虫有效的天然物质制造的
C. 是利用多种有毒物质杀虫成分,经过提炼后制造的
D. 是利用有毒植物中使害虫不能产生抗药性的多种杀虫成分,经提炼制造的。

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[多选题]车辆快速转弯时的离心力过大会使车辆()。
A.失稳;
B.失控;
C.发生侧滑;

[多项选择]下列关于私人物品的表述中,正确的有(  )。
A. 增加一个人对该物品的消费必然减少另一个人对该物品的消费
B. 增加一个人对该物品的消费并不影响其他人对该物品的消费
C. 该物品在财产所有权上具有独占性
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[单选题]基础设施实行天窗修制度应坚持“( )”的原则,实现设备状态修与预防性计划相结合的维方式。
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[判断题]用重铬酸钾滴定反应二氯化铁是氧化还原滴定。( )
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[单选题]等离子切割电流为250A时,割口宽度为()。
A.2.0
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[多选题]14.某行政执法机关的工作人员李某在进行行政执法活动时扣押了黄某的轿车,并在使用过程中将汽车损坏。后黄某发现李某扣押其汽车没有法律依据,将该行政执法机关起诉到人民法院,要求进行赔偿。关于行政执法在行政诉讼中的义务,下列说法中正确的是?
A.对人民法院受理的行政诉讼案件可以选择不出庭
B.对人民法院受理的行政诉讼案件应当依法出庭应诉
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[单项选择]低渗性缺水重度缺钠时,血清Na+
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B. 低于125mmol/L
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D. 低于140mmol/L
E. 低于120mmol/L

[多选题]地面作战时,分水器阵地应设置在火势蔓延方向的( ),存在辐射、浓烟、倒塌等安全风险时应保持足够的安全距离。
A.下风
B.侧上风
C.上风
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[判断题]不仅长期投资可提跌价准备,短期投资也可计提跌价准备。

[判断题]评价是根据测验分数、观察和报告,对被测验者的行为、优缺点或价值做出的判断。( )

[单选题]煤层顶板存在富水性中等及以上含水层或其他水体威胁时,应( )垮落带、导水裂缝带发育高度。
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[填空题]基础型课程注重学生______的培养,即培养学生作为一个公民所必需的读写算为中心的基础教养。

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A.仅对销售额中超过起征点的部分征税
B.起征点的调整由各省、自治区、直辖市税务局规定
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[单项选择]美国StreaMedia公司日前宣布,该公司的()电子邮件技术RadicalMail可让广告商传送带有声音和录像的可视电子邮件。
A. 多媒体
B. 超文本
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[单选题]《国家电网公司供电服务规范》规定,在电力系统正常状况下,客户受电端的供电电压允许偏差为:220V单相供电的,为额定值的()。
A.+10%,-7%
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[填空题]Compared with a big engine, a small one can improve the gas mileage by running closer to its __________.

[单项选择]Facts about Stroke   1 Every 45 seconds,someone in America has a stroke.Every 3.1 minutes,someone dies of one.Stroke killed an estimated 167,661 people in 2000 and is the nation’s third leading cause of death,ranking behind diseases of the heart and all forms of cancer.Stroke is a leading cause of serious,long-term disability in the United States.   2 Stroke is a type of cardiovascular(心血管的)disease.It affects the arteries(动脉)leading to and within the brain.A stroke occurs when a blood vessel that carries oxygen and nutrients(营养物)to the brain is either blocked by a clot(凝块)or bursts.When that happens,part of the brain cannot get the blood(and oxygen)it needs,so it starts to die.   3 The brain is an extremely complex organ that controls various body functions.If a stroke occurs and blood flow can’t reach the region that controls a particular body function,that part of the body won’t work as it should.If the stroke occurs toward the back of the brain,for instance,it’s likely that

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C. The wife is no longer the only person to manage the household.
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[单项选择]扁桃体Ⅲ度肿大应达到如下条件
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A.单击“开始”按钮,可打开“开始”菜单,并将鼠标指针指向开始菜单中的“程序”
B.指向相应的文件夹“附件”,出现级联子菜单后,然后单击文件夹“系统工具”
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A.正确
B.错误

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B.错误

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B.外桥
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A.正确
B.错误

[单项选择]建设工程项目总进度( )应分析和论证各项工作的进度,以及各项工作进展的相互关系。
A. 目标论证
B. 理论论证
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D. 成本论证

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