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【单选题】
日光是生命的源泉，日光中的紫外线能使皮肤中的7一脱氢胆固醇转变成( )。A.
维生素A
B.
维生素B
C.
维生素C
D.
维生素D
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【简答题】Fill in the blanks with the proper forms of the words or phrases given below. afford, rock bottom price, in view of, stick to, superior to, prepare the sales contract, with a view to, in one's opinion...
【简答题】牵引变电所根据其设置场所和结构形式可分为地上牵引变电所、 。
【简答题】In many countries, people prefer to travel by car, while in our country, bikes are the most popular form of transportation. Since we live in a developing country, the car production is not as much as ...
【简答题】Fill in each of the blanks with a suitable preposition or adverbs. 1. We can ’ t afford to fall ______ other business in using new technology. 2. Realizing that his retirement was near ____ hand, he l...
【简答题】根据句意、首字母或汉语提示完成单词。 1. Some children often c____ gum when they are free. 2. We can go to America by a____. 3. I often play basketball w____ my friends. 4. His biggest p____ is that he doesn't know how ...
【简答题】牵引变电所根据其设置场所和结构形式可分为( )牵引变电所、( )牵引变电所。
【单选题】关于孕期指导以下哪项是错误的()
A.
夫妇结婚后应立即准备怀孕
B.
婚前检查没有什么意义，可做可不做
C.
家里面养一些宠物对妊娠没有什么影响
D.
孕前指导是围产保健中的重要一环
【简答题】牵引变电所根据其设置场所和结构形式可分为地上牵引变电所和_______________。
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