对于在学术交流或合作研究中获得的数据或研究成果，研究者应该（）。
参考答案：未经人同意不得泄露
比0.5大并且比0.7小的小数只有一个．______．（判断对错）
The U.S. Federal Reserve System buys $10 million of government securities from the public, the reserve requirement is 20 percent, and all banks have zero excess reserves. A few weeks later, if no excess reserves still exist, the total impact of this action on the money supply will be a:（）
A. $ 50 million increase.
B. $ 2 million increase.
C. $ 2 million decrease.
