【判断题】在铸锭和铸件中的夹杂物按其来源可分为两类,即外来夹杂物和内生夹杂物。
【单选题】The tour guide is
A.
announcing the arrangement for today's tour.
B.
expressing warm welcome to the tourists.
C.
giving advice to the tourists.
D.
introducing a famous scenic spot.
【判断题】钢水中夹杂物来源有外来夹杂物和内生夹杂物。
【单选题】The tour guide is _____ visitors around the city.
【简答题】Being a tour guide is a very important job. In many cases, the tour guide is a traveller’ s first impression of (1) _______________ . In other cases a tour guide may be responsible for teaching touris...
【简答题】连铸坯中的夹杂物,按()分内生夹杂物和外来夹杂物。