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【简答题】
有一碱液,可能含有 NaOH 、 NaHCO 3 、 Na 2 CO 3 的混合物。今用标准酸去滴定,以酚酞为指示剂时,用去标准酸为 V 1 mL ,继以甲其橙为指示剂,又用去标准酸 V 2 mL 当 V 1 < V 2 时,则该混合碱的组成为 和 。
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举一反三
【单选题】Most customers are pleasant but some are unhappy because __.
A.
they don't think the skill to make coffee is necessary for students
B.
they think the cafe should be open for business
C.
they feel that the work is hard for students
D.
they think the special coffee is too expensive
【单选题】The project my students are working is quite challenging because it involves many professional skills. [ ]
A.
for which
B.
on which
C.
of which
D.
at which
【单选题】What is the best title of the passage?
A.
Team Building
B.
Problem Solving
C.
Communication Skills
D.
Company Management
【单选题】The most successful post-career athletes are those who can take the identity and life skills theylearned in sports and__________ them to another area of life．
A.
utilize
B.
employ
C.
apply
D.
exert
【单选题】What our company values most in employing people is their basic quality and practical skills.
A.
我们公司的最大价值在于它所雇用的员工具备了基本素质和实用技能。
B.
在培训员工时，我们公司大多会重视人的基本素质和实际技能。
C.
在招聘员工时，我们公司最看重的是人的基本素质和实际技能。
D.
我们公司最值得称道的是它培训员工的基本素质和实用技能。
【单选题】It can be concluded from the passage that newspaper readers
A.
apply reading techniques skillfully
B.
jump from one newspaper to another
C.
appreciate the variety of a newspaper
D.
usually read a newspaper selectively
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