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锯切金属消耗大、产生锯屑火花和(),操作环境不好。
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肺动脉口狭窄不会出现下列哪种表现()
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调质钢一般是指经过调质处理的合金结构钢。
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下列关于药物、毒物和食物的说法正确的是:
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以下疾病引起的呼吸衰竭属于泵衰竭的是().
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高远球的击球点,应在击球一侧肩部的位置是()
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公民S负责经营A市一大型私营连锁超市W,W超市在A市(B)(C)D区均有分店。S委托公民H前往A市B区烟草专卖局办理烟草专卖零售许可证。H向专卖局工作人员出示S签署的授权委托书及S和H两人的身份证明。
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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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下列选项中不能称之为规律的是() ①生产关系要适应生产力 ②苹果落地 ③新陈代谢 ④水往低处流
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混凝土初凝后立即进行保温保湿养护,混凝土浇筑完毕后,须在()h内加以覆盖,并浇水养护。