[填空题]正弦交流电的有效值是最大值的( )
)。

某工程项目业主与监理单位及承包商分别签订了施工阶段监理合同和工程施工合同。由于工期紧张，在设计单位仅交付地下室的施工图时，业主要求承包商进场施工，同时向监理单位提出对设计图纸质量把关的要求。
(一)监理单位为满足业主要求，由项目土建监理工程师向业主直接报送监理规划，其部分内容如下。
1．工程概况，
2．监理工作范围和目标；
3．监理组织；
4．设计方案评选方法及组织设计协调工作的监理措施；
5．因设计图纸不全，拟按进度分阶段编写基础、主体、装修工程的施工监理措施；
6．对施工合同进行监督管理；
7．施工阶段监理工作制度……
(二)由于承包商不具备防水施工技术，故合同约定：地下防水工程可以分包。在承包商尚未确定防水分包单位的情况下，业主代表为保证工期和工程质量，自行选择了一家专承防水施工业务的施工单位，承担防水工程施工任务(尚未签订正式合同)，并书面通知总监理工程师和承包商，已确定分包单位进场时间，要求配合施工。
1．监理规划是否有不妥之处为什么？
2．以上合同约定中不妥的做法有哪些？
3．总监理工程师接到业主通知后应如何处理？

Part C Directions: Read the following text carefully and then translate the underlined segments into Chinese. Your translation should be written clearly on ANSWER SHEET 2. Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materials; cosmic rays; and substances in the human body, such as radioactive potassium in bone and radioactive carbon in tissues. These natural sources account for an exposure of about 100 million a year for the average American. The largest single source of man-made radiation in medical X-rays, yet most scientists agree that hazards from this source are not as great as those from weapons-test fallout, since strontium-90 and carbon-14 become incorporated into the body, hence delivering radiation for an entire lifetime. (46) The issue is, however, by no means uncontroversial; indeed, the last two decades have witnessed intensified examination and dispute about the effects of