While a client with hypertension is being assessed, he says to the nurse, "I really don't know why I'm here. I feel fine and haven't had any symptoms. " Which of the following would be the nurse's best response

A．"Symptoms of hypertension are often not present. "

B．"Symptoms of hypertension signify a high risk of stroke. "

C．"Symptoms of hypertension occur only with malignant hypertension. "

D．"Symptoms of hypertension appear after irreversible kidney damage has occurred. "

在施工过程检查中发现某焊工的合格证已过有效期。

在进行分项工程质量验收时，有下列事件发生：

事件一：锅炉本体已安装完毕，但钢骨架因施工过程中保护不够造成局部垂直度超差。

事件二：与锅炉本体连接的主干管上，发现有一段管子的壁厚比设计要求小了1mm；该段管质量证明书和验收手续齐全，除壁厚外，其他项目均满足设计要求；是由于当时工期紧，原规格管数量不够而采用现有管子造成的。

工程在供暖期到来时按期完工，但因建设单位配套设施尚不具备条件，没能进行系统试运。当寒潮突然袭击，气温骤降后，发现一台主要设备和部分阀门冻裂，经查是因为施工单位在水压试验后，残留的水没有排净造成的，施工单位对此事故进行了处理。

锅炉房安装工程开工前应办理什么手续？