【单选题】若f,g是满射的,则复合函数g○f必是___
【单选题】船用辅锅炉以蒸馏水做给水,其含盐量应低于()mg/L(NaCl)。
【单选题】According to the report, which of the following action should be taken to solve the two key areas?
A.
Issuing more bank notes.
B.
Changing the ownership.
C.
Improving market mechanism.
D.
Drawing more investment.
【多选题】海上丝绸之路促进了我国商业对外发展与交流,早期我国对外的主要输出品是( )。
【单选题】Which of the following is the correct translation of “Xie ke huang”?
【单选题】热力除氧的原理是建立在气体的亨利定律和( )定律的基础上的
【单选题】海上丝绸之路促进了我国商业对外发展与交流,早期我国对外的主要输出品是( )。