继电器的返回系数是（）与（）之比。
“我不得不和历史作战”，诗句出自北岛《（）》一诗。
呼吸肌训练有三种形式，是（）、（）、（）
Click the Exhibit button and examine the data from the EMP table. The COMMISSION column shows the monthly commission earned by the employee. Which two tasks would require subqueries or joins in order to be performed in a single step? （） ["listing the employees who earn the same amount of commission as employee 3","finding the total commission earned by the employees in department 10","finding the number of employees who earn a commission that is higher than the average commission of the company","listing the departments whose average commission is more than 600","listing the employees who do not earn commission and who are working for department 20 in descending order of the employee ID","listing the employees whose annual commission is more than 6000"]
宏观投资管理的主体是（）。 ["国务院和省级政府","国家","行业部门","国家发展与改革委员会"]
动压效应
