问题
单项选择题
离心泵检修隔离交出时，若检修任务为更换联轴节螺栓，必须（）后方可检修。
A.关闭出口阀
B.关闭入口阀
C.关闭回流阀
D.断电
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
离心泵检修隔离交出时，若检修任务为更换联轴节螺栓，必须（）后方可检修。
A.关闭出口阀
B.关闭入口阀
C.关闭回流阀
D.断电
参考答案：D
Passage Two
According to the journalistic code of ethics, a newspaper must ______.
A．accept only responsible advertisers
B．separate editorials from news
C．interpret news according to its editorial viewpoint
D．determine what the reader should know about the news