OK, now, so there's an interesting thing to note, which is that we can use the usual product rule for derivatives with vector expressions, with dot products or cross products.
还有个很有趣的现象要注意一下，就是我们可以用乘积法则,对向量表达式求导，无论是点乘或叉乘。
The exhibition is China's enterprises to promote products, meet customers, trading orders reached a very important vector.
展览已是我国企业推介产品、结识客户、达成订货交易的一个非常重要的载体。
The calculation of an inverse matrix is a lot of work, but by using the properties of vector cross products we can simplify the calculations.
计算逆矩阵的工作量较大，但是通过逆矩阵的叉积我们可以简化计算。
A new method for construction of a cloning vector for direct ligation with PCR products was described.
本文描述一种构建与P CR产物直接连接的克隆载体的方法。
Methods the total RNA were prepared from Z10 virus infected cells and the RT PCR products was cloned into t vector, sequenced and analyzed by using DNASTAR software.
方法从Z 10病毒感染的细胞提取总rna，将逆转录聚合酶链反应(RT PCR)扩增的产物纯化后克隆于t载体并进行序列测定，应用dnas TAR软件分析比较。
Methods RT PCR products were amplified from S85 46 virus infected cells, cloned into T vector, sequenced and analyzed using DNASTAR software.
方法将特异性引物从S8546病毒感染细胞PCR扩增的产物克隆于T载体，正确的克隆纯化后测序，应用DNASTAR软件比较分析。
Methods the total RNA was extracted from Z37 virus infected cells and the RT-PCR products were cloned into t vector, sequenced and analyzed by DNASTAR software.
方法设计出针对各片段的特异性引物，用P CR方法从Z 37病毒感染的细胞提取细胞总rna，逆转录扩增、产物克隆t载体，纯化后测序，测定的序列应用DNASTAR软件比较分析。
Methods The L and M segment cDNA of Hantavirus Q32 strain was amplified by RT-PCR. The purified PCR products were sequenced directly or cloned into pGEM-T Vector and then sequenced.
方法设计特异的PCR引物，用RT-PCR技术分段扩增Q32株全长L、M片段，PCR产物纯化后直接测序，或用T-A克隆方法进行PCR产物克隆，然后进行遗传进化分析。
Methods The L and M segment cDNA of Hantavirus Q32 strain was amplified by RT-PCR. The purified PCR products were sequenced directly or cloned into pGEM-T Vector and then sequenced.
方法设计特异的PCR引物，用RT-PCR技术分段扩增Q32株全长L、M片段，PCR产物纯化后直接测序，或用T-A克隆方法进行PCR产物克隆，然后进行遗传进化分析。
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