主页
学科
搜索
账户
常见问题
当前学科:初级钢轨探伤工
题目:
单选
超声波纵波又称为()。
A . A、压缩波
B . B、疏密波
C . C、压缩波与疏密波
D . D、剪切波
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
Majored Finance An increase in students (11)to study economics at university is being attributed to (归因于)the global economic crisis awakening a public thirst for knowledge about how the(12)system works. Applications for degree courses beginning this autumn were up by 15% this January, according to UCAS, the Universities and Colleges Admissions Service. A(13)for the Royal Economic Society said applications to do economics at A-level were also up. Professor John Beath, the president of the society and a leading lecturer at St Andrews University, said his first-year lectures—which are open to students from all departments—were (14)crowds of 400, rather than the usual 250. "There are a large number of students who are not (15)majors, who would like to learn something about it. One of the things I have done this year is to relate my teaching to contemporary (16)in a way that one hasn't traditionally done," he added. University applications rose 7% last year. But there were rises above average in several subjects. Nursing saw a 15% jump, with people's renewed interest in (17)in the public sector (部门) ,which are seen as more secure in economic crisis. A recent study showed almost two thirds of parents (18)schools should do more to teach pupils about financial matters, and almost half said their children had asked them what was going on, although a (19)of parents felt they did not understand it themselves well enough to explain. Zack Hocking, the head of child trust funds, said: "It's possible that one good thing to(20)from the downturn will be a generation that's financially wiser and better equipped to manage their money through times of economic uncertainty." 20.()
具有甲、乙和丙级资质的单位,可承担相应的咨询业务。
下列关于易燃、可燃液体在管道运输时防静电措施的说法,正确的是()。
露天矿常用的矿石损失与贫化的指标有()。
患者女,40岁。右上后牙痛昨夜未眠,要求诊治。查:右上6龋深,有嵌塞食物在内,龋乳头红肿,探出血,叩诊(+),无明显松动度。主诉牙有效的处理方法是()。
在阿富汗战争中,由于信息系统与作战系统的高度一体化,从发现一个机动目标到发动袭击仅需要()时间。
患者男,2岁,因“发热、头痛、呕吐、咳嗽3d,烦躁不安1d”来诊。查体:T39.5℃,BP98/60mmHg;精神萎靡;瞳孔等大,对光反射存在;颈强直;胸、腹部可见散在出血点;克尼格征(+),布鲁津斯基征(-),巴宾斯基征(-)。血常规:WBC21.0×109/L,N0.85,L0.15。最可能的诊断是()
要坚持民主集中制,健全党内民主制度体系,以党内民主带动()民主。
大多数第三世界国家都认为哪个国家对卢旺达大屠杀事件的不干涉态度是造成屠杀的重要原因()
软交换控制设备是从电路交换向分组交换演进的核心设备,下列那一项功能不属于ZXSS10SS().