国家规范标准虽然已经过时，但也属于施工质量检查与验收的依据。

动物发病史主要包括 A. 发病时间 ...

单项选择题动物发病史主要包括 A.
发病时间 B.
发病地点 C.
发病时的主要表现 D.
饲养管理及治疗过程 E.
以上都是

Read the following groups of sentences and rearrange th...

单项选择题Read the following groups of sentences and rearrange them to form coherent Paragraphs：Paragraph One1. Later on, people began to write on pieces of leather, which were rolled into scrolls.2. In the earliest times, people carved or painted messages on rocks.3. In the middle Ages, heavy paper called parchment was used for writing; books were laboriously copied by hand.4. With the invention of the printing press in the middle of the fifteenth century, the modern printing industry was born.5. Some form of written communication has been used throughout the centuries.

采用相控调压的电力机车在实施加馈电阻制动时，电枢回路（）外加电源。

未知题型采用相控调压的电力机车在实施加馈电阻制动时，电枢回路（）外加电源。