一级价格体系是矿与区队、区队与区队之间的结算价格,主要是()
A.采掘工程价格
B.单项工程价格
C.产品加工维修价格
D.服务价格
参考答案:A, B, C, D
An army spokesman stressed that all the soldiers had been ordered _____ clear warnings before firing
any shots. [ ]
A. to issue
B. being issued
C. to have issued
D. to be issued
7,9, -1, 5, ( )
A.3 B.-3 C.2 D.-1