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【简答题】
用7.5g有杂质的锌粒和足量的稀盐酸反应生成标1.12L氢气，求锌粒的纯度（锌粒中杂质与稀盐酸不反应）？在标向收集到的氢气中通入一定量的氧气，充分反应后测得在相同条件下剩余气体0.28L，求通入氧气在标的体积？
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举一反三
【单选题】Television ______ a strong ______ children.
A.
is...influence on
B.
has...influence on
C.
is...influence to
D.
has...influence to
【单选题】Other students joined in the protest， and _______ a large crowd gathered outside the building。
A.
after all
B.
as soon as
C.
long before
D.
before long
【单选题】Why were the hostages held?
A.
To protest a decision by Nigeria's government.
B.
To protest new policies by Shell oil company.
C.
To place a new council.
D.
To prevent the opposing ethnic group.
【单选题】When concerned parents protest the excessive sex or violence on television, they often seek control of television from some outside agency. Our research, however, suggests that the most effective cont...
A.
find that their children like to watch those sex or violence TV programs
B.
hope that school or society can do something to control bad TV programs
C.
feel that they can exert some influences on their children at home only
D.
realize that there is a generation gap between them and their children
【单选题】The collecting bank will make a protest only when ( ).
A.
the documents are rejected
B.
a case of need is nominated
C.
specific instructions concerning protest are given
D.
protective measures in respect of the goods are taken
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