在锅炉运行中，必须对锅水进行监督监测，使水质达到国家规定的标准。
参考答案：对
从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）
A．A
B．B
C．C
D．D
When assessing a client with chest pain, the nurse obtains a thorough history. Which statement by the client is most suggestive of angina pectoris
A．"The pain lasted for about 45 minutes. "
B．"The pain resolved after I ate a sandwich. "
C．"The pain worsened when I took a deep breath. "
D．"The pain occurred while I was mowing the lawn. "
