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当前学科：化学制药工艺考试
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收缩期的一级杂音是（）
石油化工中常用的惰性气体有（）
患者本人复印自己病历，需携带（）。
机械设计的一般程序，应该是()。
Dear Sirs, RE: COUNTER-OFFER FOR MOUNTAIN BICYCLES Thank you for your letter about the offer for the captioned mountain bicycles．Although we appreciate the quality of your bicycles, their price is too high to be acceptable．Refering to the sales contract No．8998, you will find that we ordered 1000 bicycles with the same brand as per the terms and conditions stipulated in that sales contract, but the price was 15% lower than your present price．Since we placed the last order, price for raw materials has been decreased considerably．Retailing price for your bicycles here has also been reduced by 5%．Accepting your present price will mean great loss to us, let alone profit．We would like to place repeat orders with you if you could reduce your price at least by 15%．Otherwise, we have to shift to the other suppliers for our similar request. We hope you take our suggestion into serious consideration and give us your reply as soon as possible. Yours truly,
关于前列腺，错误的是（）
工作票填错后，只要把错的部分划掉或者用粗线条描写，此张工作票可以继续使用。
乳化液泵站安全阀的整定压力为泵整定压力的（）。
在进行筛检试验评价时，通常以一种金标准来评价此筛检试验。若要评价该试验的真实性，应选择的指标是（）。
能用治阳痿证的药物是（）