正常情况下的井水消毒
A．碘化消毒B．紫外线消毒C．常量氯化消毒D．超量氯化消毒E．加热消毒
参考答案：C
"Do you need to buy ________?" He asks. [ ]
A. something else
B. anything else
C. nothing else
D. else anything
吊脚手架在操作中应注意哪些事项？
