根据《中华人民共和国工业产品生产许可证管理条例》的规定，工业产品生产许可证的有效期是（） ["5年","2年","1年","3年"]
一台三相异步电动机铭牌上标着220V/380V△/Y接法，当三相电源的线电压为380V时，该电机三相绕组连接方式为（） ["△","Y","Y和△均可","起动时Y，工作时△"]
为什么说淡水鱼类与海水鱼类一样营养丰富？
The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air. ["because","though","since","until"]
The court has the power to（）the time for commencing arbitration proceedings if it is of the opinion that in the circumstances of the case undue hardship would otherwise be caused. ["pretend","extend","contend","intend"]
简述烧结生产发展简况。
