排队超过()人,并维持()分钟以上,请示值班站长加人实施双人售票和兑零。
参考答案:8;3
The expert’s suggestion is that the villagers in Yunnan Province should have __________ to fresh and clean water as soon as possible.
A.entry
B.path
C.approach
D.access
当室内污染物浓度C2处于稳定状态时,所需的全面通风换气量的计算公式为()。