能力调优改进策略有（）；（）、定义良好的锁规则（说明锁的级别及何时用锁）、有效利用内存。
参考答案：均衡负载、均衡磁盘I/O
— It seems that she doesn't like the dinner very much.
—______. In fact, she's been on a diet following the doctor's advice.[ ]
A. You're right
B. So she does
C. Never mind
D. Not really.
取某样品溶液稀释20倍后，照分光光度法在240nm波长处测定吸光度为0.5582，另取其对照品配制成8.0µg/ml的对照品溶液，同法测定吸光度为0.5884，求该样品溶液的浓度是多少（）。
