在六价铬定前，所用器皿应用重铬酸钾洗液反复清洗至洁净。
参考答案：对
It is suggested that the project ______ until all the preparations have been made. [ ]
A. is not started
B. won't be started
C. isn't to be started
D. not be started
试述杆上避雷器的安装应符合哪些规定。
