The Stone age, the Iron age. Entire
epochs have been named for materials. So what to name the decades ahead The
choice will be tough. Welcome to the age of superstuff. Material science--once
the least sexy technology—is bursting with new, practical discoveries led by
superconducting ceramics that may revolutionize electronics. But superconductors
are just part of the picture: from houses and cars to cook pots and artificial
teeth, the world will sometime be made of different stuff. Exotic plastics,
glass and ceramics will shape the future just as surely as have genetic
engineering and computer science. The key to the new materials is researchers’ incre A. Because transition requires money and time. B. Because many manufacturers are unwilling to change their equipment. C. Because research on new materials is very difficult. D. Because it takes long time. [单项选择]结核病的主要传播途径是
A. 母婴垂直传播 B. 粪-口传播 C. 呼吸道传播 D. 血液传播 E. 虫媒传播 [多项选择]矿尘按粉尘成因划分为()。
A. 全尘 B. 原性粉尘 C. 惰性粉尘 D. 次生粉尘 E. 落尘 [多项选择]静脉药瘾者所致心内膜炎的特点是()
A. 常右心瓣膜受累,引起三尖瓣反流 B. 常引起脑栓塞 C. 栓塞发生在肺 D. 金黄色葡萄球菌致病常见 E. 以上均正确 [判断题]高架绝缘斗臂车在工作过程中,高架绝缘斗臂车的发动机可以熄灭。
A.正确 B.错误 [判断题]隔离开关没有灭弧装置,但可容许通断一定的大电流。 ( )
A.正确 B.错误 [单选题]视觉性言语中枢受到损伤的病人( )。
A.不能写字、画画了 B.听不懂别人说的话了 C.说话发生了困难 D.理解字词的含义发生了困难 [多项选择]Young Generation Lacking of Striving Spirit
1. 社会上不少人认为,现在的青年学生拼搏精神不够; 2. 对此你的看法是… [判断题]任何人发现危及公共消防安全的行为,都可向公安消防部门或值勤公安人员举报。( )
A.正确 B.错误 [单项选择]下列说法错误的是()
A. 胰管自胰尾直达胰头,最宽径小于3mm B. 正常胰腺实质的回声强度与相邻的肝实质回声相似或稍强 C. 沿腹主动脉纵切,可获得胰体的横断面图像 D. 胰腺长轴断面形态以胰头大而体尾小的蝌蚪型最常见 E. 腹腔动脉和脾动脉是胰腺的血管标志之一 [单项选择]采用追随式定位方式的银行( )。
A. 在市场上占有极大的份额 B. 产品创新优势 C. 反应速度快和营销网点广泛 D. 资产规模中等 [判断题]预备党员可以担任党小组组长。 ·
A.正确 B.错误 我来回答: 提交
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