【简答题】简述冷原子吸收法和冷原子荧光法测定水样中汞的原理。
【单选题】At that time people of that country _________ small government, because they said that the government is here just to keep the market open and maintain law and order. It has no business________ people...
【判断题】容易损坏的或者体积笨重的产品适合选择短渠道分销策略。()
【判断题】一年的养车费一般不足1万,所以买车时不予考虑养车费用。()