Lb4A1075金刚石钻进适用于()级岩石。
A.1~6;
B.3~8;
C.4~12;
D.7~12。
参考答案:C
It is reported that Beijing and Zhangjiakou(张家口)will compete to host the 2022 Winter Olympics, which will _____ China’s social development.
A.interest
B.benefit
C.gain
D.contain
根据《水利工程设计概(估)算编制规定》,投标保函手续费属于( )。
A.其他直接费
B.企业管理费
C.财务费用
D.非企业成本