热门试题:
[单项选择]热力膨胀阀一般用于( )。
A. 氟利昂制冷装置
B. 氨和氟利昂制冷装置。
C. 氨制冷装置
D. 所有制冷装置
[判断题]无人直升机巡检系统所需电池应指定专人检查保养。
A.正确
B.错误
[判断题]在低压线路或设备上进行带电作业时,操作人要戴工作帽,穿长袖衣服,扣紧袖口,戴绝缘手套,穿绝缘鞋或站在干燥的绝缘垫上进行
A.正确
B.错误
[单选题]肟化法测定羰基化合物加入吡啶的目的是()。
A.催化剂
B.调节溶液的酸度
C.抑制逆反应发生
D.加快反应速度
[单选题]“复兴号”动车组列车在服务备品适当位置按规定样式印制( )标识。
A.复兴号
B.RB
C.RC
D.CR
[单选题]若出现( )现象时,应首先考虑计算机是否感染了病毒。
A.不能读取光盘
B.程序运行速度明显变慢
C.启动时报告硬件问题
D.软盘插不进驱动器
[判断题]检修发电机、同期调相机,在发电机和断路器(开关)间或发电机定子三相出口处(引出线)验明无电压后,装设接地线。
A.正确
B.错误
[多项选择]在基础及墩(台)的施工质量监理中,采用滑升模板浇筑墩台混凝土时,应符合下列规定()。
A. 滑升模板浇筑墩台混凝土时宜采用低流动度或半干硬性混凝土
B. 浇筑应分层分段进行,各段应浇筑到距模板上口不少于100~150mm的位置为止
C. 振捣应采用插入式振捣器
D. 每一整体结构的浇筑应连续进行,若因故中断,则应按施工缝处理
E. 混凝土脱模时的强度宜为0.2~0.5MPa,脱模后如表面有缺陷,应及时予以修理
[单项选择]《放射性药品使用许可证》的有效期为()。
A. 1年
B. 2年
C. 5年
D. 15年
E. 20年
[多项选择]在通信行业,长期增量成本()。
A. 通常是基于历史成本计算的
B. 通常是基于前瞻性成本计算的
C. 可以用来确定网间互联接续费
D. 只包括变动增量
E. 只包括固定成本增量
[判断题]坚持党要管党,全面从严治党,"严"是要害。( )
A.正确
B.错误
[单选题]在下列财务业绩评价指标中,属于反映企业盈利能力状况基本指标的是:
A.营业利润增长率
B.总资产报酬率
C.总资产周转率
D.资本保值增值率
[填空题]CRH380B型动车组受电弓气囊压力值随列车速度的增加( )。
[判断题]( )M7130平面磨床的三台电动机都不能启动的大多原因是整流变压器没有输出电压,使电动机的控制电路处于断电状态。
A.正确
B.错误
[单项选择]糖类的吸收形式是()。
A. 淀粉
B. 多糖
C. 寡糖
D. 糊精
E. 单糖
[单选题]A.1~2L/min
A.2~4L/min
B.4~6L/min
C.6~8L/min
D.8~10L/min
E.重度缺氧吸氧的流量为( )
[单项选择]
What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.
A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus; the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don&rs
A. narratives
B. forecasts
C. communications
D. descriptions
[单项选择]喉部最常见的良性肿瘤是()
A. 纤维瘤
B. 乳头状瘤
C. 血管瘤
D. 软骨瘤
E. 腺瘤
[单选题]【单选】通常情况下,低空下降率应遵守以下限制:高于机场标高750米(2500英尺)至 300米(1000英尺),下降率不大于______英尺/分钟,如因特定程序、天气等原因,预计下降率可能达到或超过以上限制时,机组应在进近简令中予以说明。
A.1000
B.1500
C.2000
[多选题]变压器有哪几种故障()。
A.绕组故障
B.套管故障
C.分接开关故障
D.铁芯故障
[单项选择]
{{B}}TEXT D{{/B}}
For the first two-thirds
of the 20th century, chemistry was seen by many as the science of the future.
The potential of chemical products for enriching society appeared to be
unlimited. Increasingly, however, arid especially in the public mind, the
negative aspects of chemistry have come to the fore, Disposal of chemical
by-products at waste-disposal sites of limited capacity has resulted in
environmental and health problems of enormous concern. The legitimate use of
drugs for the medically supervised treatment of diseases has been tainted by the
growing misuse of mood-altering drugs. The very word chemicals has come to be
used all too frequently in a pejorative sense. There is, as a result, a danger
that the pursuit and application of chemical knowledge may be seen as bearing
risks that outweigh the bensfits.
It is easy to underestimate
the central role of chemistry in modern society, but chemical products a
A. The Positive Impact of Chemistry
B. The Harmful Effects of Chemicals
C. Progress in Chemistry
D. Chemistry and Society
[多选题]PPPOE 拨号上网,BRAS 返回”691”错误,可能原因( )
A.AAA中NASPORT与实际不符
B.端口数据未做
C.通道未建立
D.帐号密码错
[单项选择]三相半波可控整流电路带电阻性负载时,其触发延迟角α的移相范围是()。
A. 0°—120°;
B. 0°—150°;
C. 0°—180°;
D. 0°—90°。
[单项选择]造成甲亢术后甲状腺危象最主要的原因是()
A. 精神紧张
B. 术前准备不充分
C. 术中挤压甲状腺
D. 术中补液不够
E. 术后出血
[单项选择]A. It doesn’t matter.
B. I don’t feel well.
C. Not too bad.
D. That’s all right.
[单项选择]下列因素中,是全连续式工艺布置型式的优点()。
A. 轧机较多
B. 轧线较长
C. 粗轧能力较大
D. 板坯出炉温度较高
[单选题]当列车驶进电气化区段前,需注意货物装载状态,要( )油罐车顶上盖等
A.收起
B.半开
C.打开
D.关闭
[单项选择]设计数据库的存储结构属于( )。
A. 需求分析
B. 概念设计
C. 逻辑设计
D. 物理设计
[判断题]厂房内疏散楼梯的最小净宽度不宜小于1.20m,疏散走道的最小净宽度不宜小于1.40m,门的最小净宽度不宜小于0.90m。
A.正确
B.错误
[单选题]在低压带电导线未采取绝缘措施时,()不准穿越。
A.作业人员
B.工作负责人
C.工作签发人
D.工作许可人
[单选题]如果受处分的消防救援人员衔级工资档次为最低档次的,( )处分。
A.警告
B.严重警告
C.记过
D.记大过