热门试题:
[判断题] 二级母钟故障会导致子钟停止走时。( )
A.正确
B.错误
[判断题]某检修单位试验班到某110千伏变电所进行出线电缆耐压试验,许可开工后,试验过程中,工作负责人指派一名专责监护人监护试验后,离开试验地点到一旁吸烟,试验人员在未将被试验的电缆进行充分放电、未戴绝缘手套更换试验引线,专责监护人未制止,更换前忘记将试验装置电源断开,造成人身触电。
该起事故存在违章行为:试验人员在未将被试验的电缆进行充分放电。违反《安规》关于“未接地的大电容被试设备,应先行放电再做试验”的规定。
A.正确
B.错误
[单项选择]修复前口腔准备不包括()
A. 龋病治疗
B. 牙周洁治
C. 松动牙拔除
D. 余留牙比色
E. 拆除不良修复体
[多项选择]按税法规定,下列固定资产中允许计提折旧的有( )。
A. 以经营租赁方式租入的固定资产
B. 以融资租赁方式租入的固定资产
C. 以经营租赁方式租出的固定资产
D. 以融资租赁方式租出的固定资产
[多项选择]牙釉质细胞外基质蛋白主要有以下几大类()
A. 釉原蛋白
B. 釉蛋白
C. 非釉原蛋白
D. 蛋白酶
E. 非金属蛋白酶
[多项选择]手机终端连接PC需要打开的端口有哪些?()
A. Control Diag Port
B. Control Modem
C. Control RemNet
[简答题]问题:请根据此案件分析民事诉讼法中法院调解与判决的关系。
[判断题]人在梯子上时,禁止移动梯子。
A.正确
B.错误
[单选题]在新抹砂浆、现浇混凝土面层涂饰建筑涂料,常温要求的时间分别是( )d以上。
A.7、14
B.14、21
C.14、14
D.21、28
[单项选择]下列关于血糖生成指数说法正确的是()。
A. GI=某食物在食后2小时血糖/相当含量葡萄糖在食后2小时血糖×100%
B. GI=某食物在食后2小时血糖曲线下面积/相当含量葡萄糖在食后2小时血糖曲线下面积×100%
C. GI=某食物在食后1小时血糖/相当含量葡萄糖在食后1小时血糖×100%
D. GI=某食物在食后1小时血糖曲线下面积/相当含量葡萄糖在食后1小时血糖曲线下面积×100%
[单项选择]
A. or
B. and
C. to
D. but
[单选题]生产经营单位采用新工艺,新技术,新材料或者使用新设备时,应对从业人员进行()的安全教育和培训。
A.普及
B.车间级
C.专门
D.班组级
[单选题]接近被连挂的车辆时,不准超过( ) km/h。
A.5
B.15
C.30
D.40
[单选题] 10kV及以下高压线路、设备不停电时的安全距离为( )m。
A. 0.35
B. 0.6
C. 0.7
D. 1.0
[判断题]“十三大”的中心任务是加快和深化改革。
A.正确
B.错误
[单选题]根据《税收征管法实施细则》规定,对偷税加收滞纳金的起止时间规定为,从查出税款后的限缴期限届满次日起到实际缴纳之日止。______
A.正确
B.错误
[单选题]验电器具有自检和( )功能,自检时具有声、光等信号显示。
A.抗干扰
B.便携
C.易检修
D.防水
[判断题]脱贫人口小额信贷是纯信用贷款。
A.正确
B.错误
[单选题]调节阀经常小开度工作时,宜选用( )特性
A.等百分比
B.快开
C.直线
D.抛物线
[不定项选择题]共用题干
第一篇
Putting Plants to Work
Using the power of the sun is nothing new.People have had solar-powered calculators and buildings with
solar panels(太阳能电池板)for decades. But plants are the real experts. They' ve been using sunlight as an
energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化
碳),and water into sugars
and starche(淀粉),stored energy that the piants can use. This conversion
process is called photosynthesis (光合作用)Unfortunately, unless you' re a plant, it's difficult and
expensive to convert sunlight into storable energy. That's why scientists are taking a closer look at exactly
how plants do it.
Some scientists are trying to get plants,or biological cells that act like plants, to work as very small
photosynthesic power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in
Golden. Cobo.,is working with green algae(水藻).She's trying to trick them into producing hydrogen
instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficient-
ly ,the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthe-
sis , plants normally make sugars or strchds. "But under certain conditions,a lot of algae are able to use the
sunlight energy not to store starch , but to make hydrogen."Ghirardi says. For example ,algae will produce hy-
drogen in an airfree environment. It' s the oxygen in the air that prevents algae from making hydrogen most of
the time.
Working in an airfree environment, however, is difficult. It's not a practical way to produce cheap
energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐)
from the environment that the algae grow in, they will make hydrogen instead of sugars,even when air
is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly,and not much
hydrogen is produced. Still ,the researchers see this as a first step in their goal to produce hydrogen efficiently
from algae. With more work,they may be able to speed the cells' activity and produce larger quantities
of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to
get and to feed, Ghirardi says,and they can grow almost anywhere:"You can grow them in a reactor, in a
pond. You can grow them in the ocean. There's a lot of flexibility in how you can use these organisms."
What does Ghirardi say about algae?
A.They can be a good energy source.
B.They grow faster in a reactor.
C.They will be planted everywhere.
D.They are cheap to eat.
[单项选择]根据《建筑工程施工质量验收统一标准》,施工质量验收的最小单位是()。
A. 单位工程
B. 分部工程
C. 分项工程
D. 检验批
[单项选择]下列着色剂中何种为天然着色剂()
A. 苋菜红
B. 胭脂红
C. 赤鲜红
D. 甜菜红
E. 新红
[填空题]按照ISM规则和NSM规则的要求,下列哪些公司必须持有DOC。()
[单选题]在防雷装置中用以接受雷云放电的金属导体称为( )。
A. 接闪器
B. 接地引下线
C. 接地体
[判断题]根据《建设工程安全生产管理条例》规定,施工单位编制的达到一定规模的危险性较大的分部分项工程专项施工方案实施时,施工项目负责人和专职安全生产管理人员必须进行现场监督。( )
A.正确
B.错误
[单项选择]首席风险官发现期货公司资产被抽逃、占用、挪用、查封、冻结或者用于担保的,期货公司应当按照()的整改意见进行整改。
A. 公司住所地中国证监会派出机构
B. 中国期货业协会
C. 期货公司股东大会
D. 期货公司董事会
[单选题] 拆除管道及容器时,不用查清其残留物的种类、化学性质,采取相应措施后,方可进行拆除施工。 ( )
A.正确
B.错误
[判断题]公文的撰拟一般由秘书或业务部门人员起草,这些草拟的人员就是公文的法定作者。( )
[单选题]以下作业需取得特种作业证的是( )。
A.电工作业、高处作业
B.高处作业、低处作业
C.焊接与热切割作业、变电站内除草
D.危险化学品安全作业、孔洞开挖
[多选题]依据《铁路客运运价规则》第十二条规定:旅客票价起码里程正确的选项是( )。
A.客票20千米
B.空调票20千米
C.加快票200千米
D.卧铺票400千米
[简答题]在启动发电机定冷水系统前,应对定子水箱进行冲洗,直至______,方可启动水泵向系统通水。
[单项选择]X62W型铣床主轴变速采用()机构。
A. 孔盘变速操纵
B. 凸轮变速
C. 液压变速
[单项选择]液压泵是通过密封容积的变化来吸油和压油的,故称为()。
A. 容积泵
B. 离心泵
C. 真空泵
D. 转子泵
[单选题]对不能判明发、到站或托运人、收货人的无标记货物,应在( )、货物损失处理人员等不少于3人的情况下打开包装检查,寻找能正确交付的线索。
A.A、当班货运员
B.B、货运值班员
C.C、车站站长
D.D、车站货运负责人