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简述热力系统在线氢电导率仪的工作原理。
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21.OH-的共轭酸是( )
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行政诉讼期间，有（）情形的，停止具体行政行为的执行。
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当失访比例超过多少时，会影响评价结果（）
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设正四棱柱的顶面是水平面，若截平面是正垂面，且不同时通过顶面和底面，则其截交线的俯视图不可能为（）
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男性，32岁，1h前饱食后下田劳动，突感腹部剧烈绞痛，伴频繁呕吐，体检面色苍白，四肢湿冷，脉率120次／分，血压11．4／9．3kPa（86／70mmHg），全腹压痛，反跳痛，肝浊音界存在，肠鸣音消失，为明确诊断最具有参考价值的检查是（）
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可见光以电磁波的形式传播，它是在红外线与（）之间的可见光波。
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Materials and Tools for Language Learning ① The range of materials and tools available to help you with your language studies is huge, from dictionaries to language courses. All of them can help you in different ways, and the appropriate use of these materials and courses will make your language learning much easier and more effective. ② Possibly the most useful tools there are for learning a language are dictionaries. Dictionaries come in a number of formats including bilingual, monolingual, illustrated, electronic and online. Bilingual dictionaries are perhaps the most useful ones for beginners and intermediate learners, while monolingual dictionaries, which are designed for native speakers, are also useful for advanced learners. Pocket dictionaries are good for quick reference and easy to carry around. Larger dictionaries are better if you want more definitions, examples of usage, and information about pronunciation, and grammar. Electronic dictionaries are available as handheld units, or as software. Handheld ones are portable, easy and quick to search, and often provide other functions, such as, text-to-speech, voice recognition and speech synthesis organizers, address books. They tend to be rather expensive though. Software dictionaries offer many of the same functions, and can be used on computers, and mobile phones. ③ The traditional courses tend to consist of textbooks containing dialogues, exercises, notes on grammar, and maybe cultural information. Accompanying cassettes, CDs and/or mp3s are often available. Most such courses are intended for complete beginners or people with only minimal knowledge of the language. Intermediate and advanced-level courses are available for some of the popular languages, such as French, German, Italian and Spanish. ④ Audio courses usually consist solely of cassettes or CDs, though some may also include a limited amount of printed material. All dialogues, exercises, instructions and explanations are recorded and the focus of these courses is teaching you to understand and speak the languages. They are very good at teaching you authentic pronunciation and a manageable amount of vocabulary. ⑤ Various computer-aided courses are available on CD-ROMs and DVDs. Each course is different but they generally include dialogues, audio, exercises and tests. Some also include phrasebooks, dictionaries, videos, games and provide online and/or telephone support. With audio courses, you can learn（）
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商业银行违反规定提高或者降低利率及采取不正当手段吸收存款、发放贷款的，由人民银行责令其改正并处罚。216、
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压迫性和非压迫性脊髓病变的鉴别诊断主要依靠（）