[单选题]尽管大家开始抵制珍稀动物的皮草产品,但仍有家居制造商将珍稀动物的皮毛用于家居饰品.几年前专家发明了一种新的高仿合成皮草,受到了家居制造商广泛的好评.但从最近几年的统计看,各地为获取皮毛而对珍稀动物进行捕杀的活动却并没有减少.以下哪一项正确,最有助于对“捕杀活动没有减少”进行解释A.生产新的高仿合成皮草比生产原来的合成皮草的成本更低B.新的高仿合成皮草与动物皮毛的质地相似,很难区分C.绝大部分珍稀动物的皮毛用在越来越流行的皮草服饰上D.家居制造商在销售大的家居物件时,往往将家居饰品当作赠品免费送给购买者
[单选题]某知名物业管理企业聘用了近百名保安员为客户提供门卫、巡逻、秩序维护等服务,这些保安员只能被派往( ).A.重点单位区域内B.大型活动场所内C.物业管理区域内D.公共娱乐场所内
[单选题]第一组Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers&39; recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.Modern uniflow scavenged engines have______.A.a single injector mounted in the center of the cylinder headB.several injectors mounted around the external boundary of the cylinder headC.a single injector mounted at the external boundary of the cylinder headD.several injectors mounted in the center of the cylinder head
[单选题]对抗凝血酶作用不敏感的因子A.因子ⅤaB.因子ⅩaC.因子ⅨaD.因子ⅪaE.因子Ⅻa
[单选题]与Trinder反应无关的测定项目A.葡萄糖B.尿酸C.胆红素D.胆固醇E.以上皆不是
[单选题]在Windows中,要关闭当前应用程序窗口,可以使用组合键(34).A.Alt+F4B.Ctrl+F4C.Alt+空格D.Ctrl+空格
[单选题]8086 CPU经加电复位后,执行第一条指令的地址是( ).A.FFFFFHB.03FFFHC.0FFFFHD.FFFF0H
[单选题]窗体的边框类型BorderStyle属性默认是Sizable,表示 ______.A.窗体没有边框B.窗体是固定单边框C.固定对话框D.窗体边框是可调整的
[判断题]计算机的硬件系统通常由机箱、显示器、鼠标和键盘组成.
[单选题]关于字节I/O流,下列叙述不正确的是( ).A.字节数据来自于二进制文件B.DataOutStream的方法flush( )的功能是清空输出流,并把缓冲全部内容写入输出流中C.字节输入流首先要实现Datalnput接口D.所有的字节输出流都继承于Writer类
[单选题]若将文本字符串“15”、“8”、“6”按降序排序,则排序的结果为( ).A.“15”、“8”、 “6”B.“6”、“8”、“15”C.“8”、“6”、 “15”D.“8”、“15”、“6”
[单选题]不含味蕾的舌乳头是A、轮廓乳头B、菌状乳头C、叶状乳头D、丝状乳头E、带状乳头
[单选题]家族史中,其舅舅有类似发病情况,该病的诊断是A.ITPB.DICC.急性白血病D.血友病E.血管性血友病
[单选题]参与肝脏结合型初级胆汁酸生成的氨基酸是A.甘氨酸B.丙氨酸C.亮氨酸D.组氨酸E.蛋氨酸
[单选题]1 7 .采用赊销、分期付款结算方式的,增值税专用发票的开具时限为( ) .A .货物发出的当天B .合同约定的收款日期的当天C .货物移送的当天D .合同签订的当天
[单选题]下列哪种情况不宜作种植义齿修复A、后牙游离缺失,牙槽嵴丰满,颌间距离过低B、个别牙缺失,缺隙区牙槽嵴正常C、全口牙列缺失,牙槽嵴中度吸收D、牙缺失伴颌骨缺损E、上前牙缺失,美观需求高
[单选题]最典型的间接金融机构是( ).A.证券公司B.商业银行C.投资银行D.保险公司
[单选题]在溶血素滴定时,下述情况定为一个溶血单位的是A.完全溶血的最高稀释度B.完全不溶血的最高稀释度C.部分溶血的最高稀释度D.微溶血的最高稀释度E.完全不溶血的最低稀释度
[单选题]患者,女,50岁,脾胃虚弱,四肢微软乏力,腹胀,食少,便溏,气弱乏力,颜面浮肿,舌淡,苔薄白,脉细,宜首选A、金樱子B、覆盆子C、芡实D、五味子E、莲子
[单选题]新版《医疗器械监督管理条例》已经2014年2月12日国务院第39次常务会议修订通过,自 ( )起施行.A.2014年6月1日B.2014年7月1日C.2014年9月1日D.2014年10月1日
[单选题]影响固定桥固位的因素是( )A、基牙受力的运动方式B、基牙的数目C、基牙的高度D、基牙的聚合角E、桥的长短