【单选题】中性点 经消弧线圈接地运行方式一般采用( )方式。
【简答题】DNA复制时,复制叉进行的半保留复制实际上是半不连续复制,()链上是连续复制,()链上是不连续合成的,即先合成出小的DN段,称为冈畸片段,然后再在酶的催化下将这些小的片段连接成长链。连接反应需要能量,细菌内以()为能量来源,动物细胞和某些噬菌体以()为能量来源。
【单选题】中性点经消弧线圈接地运行方式一般采用()
【单选题】The old lady had expected to see all her relatives when she was ill in hospital, but none came to see her ______ many of her neighbors offered their help.
【简答题】Seeing that the old lady had no chair ___, the boy offered her his own. A, to sit B to be seated C. to seat herself D. to sit on
【单选题】以下药物中不能与三氯化铁试液显色反应的是