更多"[单选题]Why are___speakers of English "的相关试题:
[单选题]因为烟气中含有SO2、SO3，当温度低于烟气露点时，水蒸汽冷凝与SO2、SO3生成亚硫酸及硫酸，对设备造成腐蚀，一般要求加热炉排烟温度不小于（）。
A.A.110℃
B.B.125℃
C.C.135℃
D.D.130℃
[单选题] The book is ________ too difficult for those pupils.
A.quite
B.very
C.rather
D.so
[单选题]Why is the water tank pressurized?
A.A. To ease draining operation
B.B. To warm up water
C.C. To allow water distribution
[单选题]Why did the bear knock at the door one cold winter evening? The bear wanted______ .
A.to eat up Snow-White and Rose-Red
B.to sleep in the room
C.to find something to eat in the house
D.to warm himself at the fire in the house
[单选题]Why did the rich man buy the farm and pay more?
A.Because the farm was a very big one.
B.Because the farm was very famous.
C.Because he was greatly interested in the old tree on the farm.
D.Because the tree on the farm was too old.
[判断题] 脱硫过程中形成的SO32-、SO42-有很强的化学活性和渗透能力。（ ）
A.正确
B.错误
[判断题]在吸收塔氧化区必须有充足的O2才能使SO3- 氧化成SO42-。( )
A.正确
B.错误
[判断题] 吸收塔入口处烟气中SO2浓度为1000ppm，相当于SO2含量为2860mg/m3。（ ）
A.正确
B.错误
[单选题]欲配制浓度3mol/LH2SO4溶液,在100ml纯水中应加入浓H2SO4( )mL。
A.50
B.20
C.10
D. 40
[判断题]当低于烟气露点温度时，由于烟气中存在SO2，在设备上可产生低温亚硫酸、硫酸腐蚀，同时SO2、SO3排放造成环境污染。
A.正确
B.错误
[判断题] SO2的排放浓度是由二氧化硫连续在线监测仪在烟囱入口处对烟气中SO2浓度检测的数值，仪器直接测量的浓度是以ppm表示。（ ）
A.正确
B.错误
[单选题] “Does she speak English or Russian?” “She doesn’t speak ________.”
A.neither
B.none
C.either
D.all
[判断题]在吸收塔氧化区必须有充足的O2才能使SO3-氧化成SO42-。（ 通密度的单位名称）
A.正确
B.错误
[单选题]用同一NaOH溶液分别滴定容积相等的H2SO4和HAC溶液,消耗的容积相等.说明H2SO4和HAC两溶液中的( )。
A.氢离子浓度(单位:mol/L下同)相等
B.H2SO4和HAC的浓度相等
C.H2SO4的浓度为HAC的浓度的1/2
D.H2SO4和HAC的电离度相等
