在铸件内部或表面有大小不等的光滑孔洞的铸件缺陷被称为()。
参考答案:气孔
因为期货价格与现货价格的变动方向一致,所以基差在合约到期之前是不变的。()
________ information! I hear you have finished writing a ________ report.
A.What an excited; seven thousand word’s
B.What excited; seven thousand words
C.What an exciting; seven-thousand-word
D.What exciting; seven-thousand-word