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两列光波在叠加点有固定相位差且不随时间而改变,是光的()条件之一
DBMS提供了内模式()来定义外模式。
从加速角度分析,Ⅰ档加速度一定比Ⅱ的加速度大。
对于某缔约国政府指定的某些有毒物质,船方应在该船开始装卸这些物质前()小时告知港口当局。
()不属于产生曲线钢轨不均匀磨耗的主要原因。
高洪水期是指当河流水位上涨至()时的一段时期。
丹福斯锚(也称燕尾锚)属于有杆大抓力锚,其锚爪转动角约为()
功能凉血止血,清热利尿,清肺胃热的药物是()。
关于生理性缩复环,正确的是()
患者白细胞计数为1.5.×109/L,但分类100个白细胞中遇到有核红细胞为20个,校正后白细胞应报告()。
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