一般来说,企业可以使用的建立标准的方法有三种:_________、_________、_________。
参考答案:统计性标准;根据评估建立标准;工程(工作)标准
He is known _____ a scientist and famous _____ his research on rice.
A.for; as
B.for; for
C.as; for
D.as; as
简述石英脉型黑钨矿床的成因