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为什么离心泵开泵前，泵体必须充满液体？

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（）指在传统灰塑山石和假山的基础上采用混凝土、玻璃钢、有机树脂等现代材料和石灰、砖、水泥等非石材料经人工塑造的假山。

按照Magoon等人的观点，含油气系统如何命名？

对某退火碳素钢进行金相分析，其组织为珠光体+渗碳体（网状），其中珠光体占93%，问此碳钢的含碳量大约为多少？

Documentation of a software package is normally produced for two purposes. One is to explain the (1) ofthe software and describe how to use them. This is known as (2) because it is designed to be read by the user of the software. The other purpose of documentation is to describe the software's internal composition so that the system can be maintained later in its life cycle. Documentation ofthis type is known as ( 3 )空白（1）处填（）

A. plans
B. cost
C. features
D. schedules