【简答题】Translate the following sentences into Chinese .(英译汉) The lubrication system makes sure that every moving part in the engine gets oil so that it can move easily.
【单选题】为了除去混在 CO 2 中的 SO 2 和 O 2 ,下列试剂使用顺序正确的是 ( ) 1 饱和 Na 2 CO 3 溶 液 2 饱和 NaHCO 3 溶液 3 浓 H 2 SO 4 4 灼热铜网 5 生石灰
【单选题】It will be __ wonderful world if all nations live in __ peace with one another. [ ]
【单选题】控制阀失灵,( )、 单向阀、电磁阀等的滑阀支承在弹簧上对振动相当敏感。
【多选题】以下关于虚拟化和云计算关系描述正确的是( )
B.
虚拟化是一种技术,云计算是一种服务模式,虚拟化推动了云计算的发展
【单选题】某温度下,向一未饱和的Na 2 CO 3 溶液中加入20g无水Na 2 CO 3 或加入50gNa 2 CO 3 ?7H 2 O晶体,都恰好使溶液达到饱和,则Na 2 CO 3 在此温度时的溶解度为( )
【简答题】英译汉:lubrication system
【简答题】在25℃,CO2气体压力等于1标准大气压时,CO2饱和水溶液中CO2的浓度约为0.034 mol.dm-3,计算溶液的pH和[CO32-]。通常把溶入的CO2都当成H2CO3,利用如下平衡式计算: H2CO3+H2O HCO3-+H3O+ Ka1=4.5×10-7
【单选题】听力原文:M: Would you like to go to see the movies with me this evening? W: I'd love to. But I’m just getting over the flu. What will the woman probably do this evening?
【单选题】I like comedies _______ I don't like documentaries at all; they're more than boring. [ ]