试设计一生物转盘脱N工艺流程。
参考答案:
A lot of countries have gained excellent achievements in space technology,China, _______. [ ]
A. such as
B. for example
C. namely
D. and so on
下列()的色散值与钻石色散值很接近。
A.立方氧化锆
B.钆镓榴石
C.钇铝榴石
D.锆石