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【多选题】
水的硬度测定中,正确的测定条件包括( )。A.
总硬度：pH ＝10，EBT为指示剂
B.
钙硬度：pH ＝12，XO为指示剂
C.
钙硬度：调pH之前，先加HCI酸化并煮沸
D.
钙硬度：NaOH可任意过量加入
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举一反三
【简答题】A．The boss of a big company. B．The police officer. C．The tour guide. D．The chief engineer.
【简答题】国际电气和电子工程师协会的简称是:
【单选题】How could they ______ that the police officer had punched the suspect without knowing the facts?
A.
assert
B.
affirm
C.
allege
D.
maintain
【单选题】The doctor explained to the police officer that it was too dangerous to ______ the bullet from his backbone.
A.
exert
B.
exploit
C.
squeeze
D.
capture
【单选题】The police officer thoroughly ______ the cause of the accident, but they couldn't find any trace.
A.
explored
B.
examined
C.
investigated
D.
analyzed
【简答题】电气和电子工程师协会的简写是( )。
【单选题】The police officer is determining who is going to be responsible()the traffic accident.
A.
for
B.
on
C.
in
【单选题】The police officer asked the children in the street.
A.
not playing
B.
do not play
C.
not to play
D.
not play
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