【判断题】变压器比异步电动机效率高的原因是由于它的损耗只有磁滞损耗和涡流损耗。
【判断题】变压器比异步电动机效率高的原因是由于它的损耗只有磁滞损耗和涡流损耗。
【简答题】听力原文:With the increasing use of refrigerators, people in the big cities usually shop for groceries once a week. Most people do their week's shopping on Fridays or Saturdays. They usually go in cars si...
【判断题】51单片机在扩展时,P0口可以在同一时刻既传送地址信息又传送数据信息。()
【单选题】The American coins are made in 6 denominations: the penny or 1 cent; the nickel or 5 cents; the dime or_________ cents; the quarter or 25 cents; the half dollar or 50 cents; and the dollar or 100 cent...
【单选题】The()may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.
B.
The ministry of commerce
D.
the commodity inspection institution