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?