更多“锅炉化学清洗中钝化常用的方法有（）。”相关的问题
急性肠炎可出现（）。
A.脓血便
B.鲜血便
C.胨状便
D.稀糊便
E.细条样便
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异丙肾上腺素的作用有（）.
A．收缩血管、舒张支气管、增加组织耗氧量
B．收缩血管、舒张支气管、降低组织耗氧量
C．舒张血管、舒张支气管、增加组织耗氧量
D．舒张血管、舒张支气管、降低组织耗氧量
E．舒张血管、收缩支气管、降低组织耗氧量
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运行中蓄电池放电可手动2QA，如空压机能打风可判断为（）故障。
A.启动发电机QF故障
B.电压调整器
C.逆流装置NL故障
D.熔断器2RD烧损
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某汽车制造厂为增值税一般纳税人，2013年4月进口汽车配件一批，海关审定的关税完税价格为144万元，从海关运往企业所在地支付运费6万元，取得承运部门开具的运输发票，进口汽车配件的关税税率为10%。该汽车制造厂进口汽车配件应缴纳的增值税额为______万元。
A.26.93
B.27.63
C.28.05
D.31.88
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评价肺通气功能较好的指标是（）。
A.肺活量
B.时间肺活量
C.每分通气量
D.肺总量
E.肺泡通气量
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临床上一些疾病会出现神经脱随销病变，如格林-巴利综合征。神经脱髓鞘后对传导功能有何影响？会产生哪些临床表现？请阐述机制。
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高炉炼铁技术方针是以（）基础，以（）为前提，以提高（）和降低（）同时并举
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某研究人员将一个带有强启动子报告基因分别插入距离酵母细胞端粒50kb和10kb的区域，发现该报告基因在距离酵母细胞端粒50kb处有表达，而距离酵母细胞端粒10kb处没有表达。对报告基因在距离酵母细胞端粒10kb处不表达的合理解释是： A．报告基因的插入改变了端粒的染色质结构 B．报告基因插入的方向有误 C．报告基因的表达产物被降解 D．转录因子不能结合到距离酵母细胞端粒10kb处
A.报告基因的插入改变了端粒的染色质结构B.报告基因插入的方向有误C.报告基因的表达产物被降解
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两个同等强度的阈上刺激，相继作用于神经—肌肉标本，如果刺激小于单收缩的时程，且第二个刺激落在前一个单收缩的收缩期内，则骨骼肌的收缩形式为
A . 完全强直收缩B . 不完全强直收缩C . 单收缩
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在公共道路、露天公共场所列队行进、表达共同意愿的活动是（)A．示威B．集会C．游行D．请愿
在公共道路、露天公共场所列队行进、表达共同意愿的活动是()A．示威B．集会C．游行D．请愿
A．示威B．集会C．游行D．请愿
B．集会C．游行D．请愿
C．游行D．请愿
D．请愿
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10.设 A，B是两个n阶矩阵，证明
\mathrm{T}\mathrm{r}(AB)=\mathrm{T}\mathrm{r}(BA).
路基填方，采用推土机推松集土、装载机装土、自卸汽车运土施工，其推土机在取土坑中推土，比较合理的基本作业方式是______。
A．上坡推土(由下向上)B．并列推土C．下坡推土(由上向下)D．挖槽推土
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Task 1Directions: After reading the following passage, you will find 5 questions or unfini
Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice. Do you know how to use a mobile phone (手机) without being rude to the people around you? Talking during a performance irritates (激怒) people. If you are expecting an emergency call, sit near the exit doors and set your phone to vibrate (振动). When your mobile phone vibrates, you can leave quietly and let the others enjoy the performance. Think twice before using mobile phones in elevators, museums, churches or other indoor public places—especially enclosed spaces. Would you want to listen to someone's conversation in these places? Worse yet, how would you feel if a mobile phone rang suddenly during a funeral! It happens more often than you think. Avoid these embarrassing situations by making sure your mobile phone is switched off. When eating at a restaurant with friends, don't place your mobile phone on the table. This conveys the message that your phone calls are more important than those around you. Mobile phones have sensitive microphones that allow you to speak at the volume you would on a regular phone. This enables you to speak quietly so that others won't hear the details of your conversations. If you are calling from a noisy area, use your hand to direct your voice into the microphone. Many people believe that they can't live without their mobile phone. Owning a mobile phone definitely makes life more convenient, but limit your conversations to urgent ones and save the personal calls until you are at home. What should you do when you need to answer a phone call during a performance? A．Call back after the performance. B．Answer it near the exit door. C．Talk outside the exit door. D．Speak in a low voice.
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我国古代哪本数学著作最早记载了勾股定理？()
A.《周髀算经》
B.《九章算术》
C.《海岛算经》
D.《孙子算经》
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