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Finally, the Christmas season is over. We can take a long breath, put up our feet, sip from a cup of good tea and relax. The frenzy, starting from Black Friday right after Thanksgiving until Christmas Eve, of gift shopping, buying, wrapping, giving, receiving, opening, returning... is exhaustive and time-consuming, but it takes place every year. There is considerable difference between the cultures in China and western countries when it comes to gift giving. In China, it is not polite to open a gift in front of the gift giver, and gift is only looked at after the guest has left. Here in America, gift givers always wrap their gifts, large or small, priceless or valueless, carefully and decorate them with colorful ribbons and little pretty paper flowers; and the lucky receiver is expected to open the gift right away in front of the giver, with great eagerness and curiosity, and should always express appreciation with the all time truthful comment, "this is just exactly what I wanted!" Well, as a matter of fact, most people would take their "always wanted" gifts back to the store to exchange for something they really wanted. Finding a gift for somebody, even a close family member, you"ll have to know what the person likes and shop for days before you can locate the perfect gift. But, still the person may not like the gift from you. Nowadays, stores would provide two copies of the receipts for anything they sell as a gift, one of which is included in the gift package so that the receiver can come back for an exchange. I know, it was unthinkable to cash out gift you get, but, times are different. Another good way to avoid all that shopping hassle is to purchase a gift card from one of the stores and send it to your niece, nephews, or a family member, so that they can get whatever they want or even keep the money.Gift giving is the same thing in China and America in that （）.
简述抑郁发作的核心症状。
导致容量依赖型高血压的主要因素（）
在脊柱退行性骨关节病中，椎体边缘增生不易发生于（ ）。
简述联动试运行应符合的规定。
下列哪种疾病属于肥胖并发症（）。
下列关于经营杠杆系数、财务杠杆系数和总杠杆系数的表述中正确的是（ ）。
什么是外汇风险？主要包括哪几种类型？
某循环冷却水系统运行工况稳定，系统连续排污，采用间断式加药，循环冷却水的初始药剂（应达到规定药剂浓度）为7.5mg/L，2h后循环冷却水的药剂浓度为7.25mg/L，若系统保有水量为6000m3商品药剂的纯度为10%，则此时应投加该药剂（）Kg。
在城市道路纵断面设计方面，对于道路纵坡的确定来说，城市道路非机动车的最大纵坡，按自行车的行驶能力控制在（）以下为宜。
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