The optimizer normally chooses a table scan if no appropriate index has been created or if an index scan would be more costly.
如果没有创建合适的索引，或者如果索引扫描的成本更高一些，优化器通常就选择表扫描。
Diagnosis may later involve an MRI scan if a tear in the hip cartilage is suspected, but this can be difficult to ascertain.
随后的诊断包括核磁共振，如果怀疑髋关节软骨撕裂，但是很难确诊。
On a subsequent scan, if a newly computed checksum is different from the previously generated checksum, the page is changing and is therefore not a good candidate for merging.
在一次后续扫描中，如果新计算的校验和不等于此前计算的校验和，则该页面正在更改，因此不是一个合格的合并候选对象。
The MSP430FW427 is used as control MCU. The function is realized by the SCAN IF module without IC circuit external, which improves the precision and sensitivity of flow measurement.
主控器采用目前国际上功耗最低的MSP430FW 427单片机，该单片机能够利用内部流量扫描模块（SCAN IF）有效地转换振荡波形，不需要外部流量检测IC，提高测量的精度和灵敏度。
The MSP430FW427 is used as control MCU. The function is realized by the SCAN IF module without IC circuit external, which improves the precision and sensitivity of flow measurement.
主控器采用目前国际上功耗最低的MSP430FW 427单片机，该单片机能够利用内部流量扫描模块（SCAN IF）有效地转换振荡波形，不需要外部流量检测IC，提高测量的精度和灵敏度。
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