【单选题】听力原文: About 100 people are now known to have died in what has been described as the worst storms ever to hit the eastern U. S. this century. The hurricane-force winds first struck the Gulf of Mexico, ...
【简答题】奈氏菌属包括()菌和()菌,形态为(),革兰氏染色()。
【简答题】联接螺纹能满足自锁条件,为什么还要考虑防松?根据防松原理,防松分哪几类?
【简答题】T0203表示换成2号刀,( )号补偿。
【简答题】请对以下商品进行HS编码归类:全棉的漂白平纹机织物,250克/平方米