IS曲线是描述产品市场均衡时，反映价格与产量之间关系的曲线。
参考答案：错
解析： IS曲线是描述产品市场均衡时，反映利率与国民收入之间关系的曲线。
Yuan Long-ping has devoted all his life to the agricultural research, and finally his efforts ________him great achievement and world fame.
A．earned
B．offered
C．presented
D．directed
SQL语句中查询条件短语的关键字是________。
A．WHERE
B．FOR
C．WHILE
D．CONDITION
