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【单选题】
发动机的作用是把( ),实现动力输出。
A.
化学能转换为机械能
B.
热能转换为机械能
C.
液压能转换为机械能
D.
动能转换为机械能
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参考答案:
举一反三
【单选题】下列叙述正确的是(  )
A.
某溶液中加入氯化钡溶液有白色沉淀生成,且沉淀不溶于稀硝酸,则原溶液一定含有SO 4 2-
B.
某溶液中加入盐酸放出能使澄清的石灰水变浑浊的无色无味的气体,则原溶液一定含有CO 3 2-
C.
将80gNaOH溶于1L水中,所得溶液中NaOH的物质的量浓度为2mol/L
D.
同温同压下的一氧化碳气体和氮气,若体积相等,则质量一定相等
【单选题】You have a computer that runs Windows Vista. You need to configure the computer to meet the following requirements: ·You must be able to make configuration changes remotely. ·You must be able to make ...
A.
A
B.
B
C.
C
D.
D
【简答题】化学调研小组的同学用氢氧化钠和稀盐酸探究中和反应,请你参与以下探究: (1)甲组同学取少量的氢氧化钠溶液于烧杯中,用酸度计测得该溶液的pH (选 填“<”、“>”或“=”)7,同时插入一支温度计,测量溶液的温度(如下图所示)。用胶头滴管吸取稀盐酸,逐滴加入盛有氢氧化钠溶液的烧杯中,边滴加边搅拌。此时可观察到的现象是:酸度计上显示的数据逐渐 (选填“增大”、“减少”或“不变”,下同),温度计上显示的...
【单选题】You have two portable computers named Computer1 and Computer2 that run Windows 7. You configureComputer1 to connect to a wireless network named Network1. You need to configure Computer2 to connectto N...
A.
At the command prompt, run Wecutil.exe es gr.
B.
At the command prompt, run Winrs.exe -environment.
C.
From Windows Firewall with Advanced Security, export the policy.
D.
From the wireless network properties of Network1, copy the network profile to a USB flash drive.
【简答题】完形填空。 Imagine you receive an e-mail that looks something like this: ARE YOU GOING TO CLASS TODAY? How does 1 this message make you feel? 2 did the sender use all capital letters? Was he or she angry, ...
【简答题】某实验小组用图 A 完成课本实验 “ 碳酸氢钠与盐酸反应的探究 ” 后,他们发现两种反应物的用量不同时反应后溶液中的成分也可能不同,于是他们对碳酸氢钠与盐酸反应后的大试管中溶液的成分进行探究,请回答以下问题: ( 1 )仪器 a的名称为 ;为检验碳酸氢钠与盐酸反应的气体产物,仪器 1盛放的试剂为 ; ( 2 )若实验室制二氧化碳应选装置 ; ( 3) 【提出假设】小组成员认为 A 中大试管的溶液的...
【单选题】Imagine you found out that ideas invented by a computer were rated higher by independent experts than ideas created by a group of humans asked to perform. the same task. Would you praise the designer ...
A.
are never superior to human ideas
B.
tend to be superior to human ideas
C.
are not necessarily superior to human ideas
D.
can no doubt to be invented by human subjects
【单选题】包装的( )是现代物流的重要标志。
A.
机械化、自动化
B.
单元化、标准化
C.
轻薄化、单纯化
D.
规格化、集装化
【简答题】完形填空 Imagine you receive an e-mail .that looks something like this: ARE YOU GOING TO CLASS TODAY? How does 1 this message make you feel? Why did the sender use 2 capital (大写) letters? Was he or she an...
【判断题】包装单元化和标准化是现代物流的重要标志,也是单元化物流的基础。
A.
正确
B.
错误
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