扩散通风适用于何种情况？

以下不属于金融期货风险控制制度的是()。

A.持仓限额制度

B.实物交割制度

C.价格限制制度

D.保证金制度

物质生产领域的补偿性支出具有( )的性质。

A．用于社会扩大再生产的支出

B．维持企业简单再生产

C．用于社会公共需求方面的支出

D．用于社会公 * * 品供给方面的支出

David Wildstein, Harry Osajnuk, and Kurt Weil, are all junior economists at the Bank of Scarsdale. Over lunch they were discussing the U.S. Federal Reserve (the Fed) and the banking system in the United States. They made the following statements regarding the overall purpose of the Federal Reserve System: Wildstein: In my opinion, the overall purpose and goal of the Federal Reserve System is to insure the deposits of individuals and firms holding funds with banking institutions. Osajnuk: The overall goal of the Federal Reserve System is to keep the discount rate flexible so that if additional funds are needed in the economy the discount rate will be reduced and if there is too much money in the economy the discount rate will be increased. Weft: The primary purpose of the Federal Reserve System is to regulate the amount of excess reserves held by member banks through the potential deposit expansion multiplier. Are the statements made by Wildstein, Osajnuk, and Weil correctWildstein Osajnuk Weil（）①A. Incorrect Incorrect Correct ②B. Correct Incorrect Incorrect ③C. Incorrect Incorrect Incorrect

A. ①

B. ②

C. ③

元至正年间工部尚书（）提出“治河二策”，即“疏塞并举”，准确地说是“疏、浚、塞”三者并举。疏就是疏导积水，浚就是浚深河床，塞就是堵塞决口。

A.女娲

B.孙叔敖

C.李冰

D.贾鲁

钙肥有那些种类？怎样施用？