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。

某企业2017年承接设备安装劳务，合同总收入200万元，预计总成本140万元，价款在签订合同时已收取，采用完工...

未知题型某企业2017年承接设备安装劳务，合同总收入200万元，预计总成本140万元，价款在签订合同时已收取，采用完工百分比法确认劳务收入。2017年已确认劳务收入80万元，截止至2018年12月31日，该劳务的累计完工进度为60%。2018年应确认的劳务收入为（）万元。