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【单选题】
以下在补体激活效应的放大作用中起重要作用的是A.
C3
B.
C2
C.
C1
D.
C5
E.
C4
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【简答题】在氯化铁溶液中存在下列平衡：FeCl 3 +3H 2 O Fe(OH) 3 +3HC1;△H＞0。回答下列问题： (1)加热FeCl 3 溶液，溶液的颜色会不断加深，可得到一种红褐色透明液体，向这种液 体中加入MgCl 2 溶液，产生的现象为 。 (2)不断加热FeCl 3 溶液，蒸干其水分并灼烧得到的固体可能是 。 (3)在配制FeCl 3 溶液时，为防止浑浊，应加入 。 (4)为了除去MgCl...
【单选题】Researchers investigating brain size and mental ability say their work offers evidence that education protects the mind from the brain's physical deterioration. It is known that the brain shrinks as t...
A.
age
B.
education
C.
health
D.
exercise
【单选题】Naturalists say that (there is evidence) to support the assertion (which) anthropoids, (whether in) (captivity) or in the native state, sometimes beat their breasts.
A.
there is evidence
B.
which
C.
whether in
D.
captivity
【单选题】At first the man refused to say anything but _____ when shown the evidence he and told everything. [ ]
A.
broke down
B.
broke out
C.
gave up
D.
gave away
【简答题】在氯化铁溶液中存在下列平衡：FeCl 3 +3H 2 O Fe(OH) 3 +3HCl △H>O。 (1)加热FeCl 3 溶液，溶液的颜色会不断加深，可得到一种红褐色透明液体，向这种液体中加入MgCl 2 溶液，产生的现象为____。 (2)不断加热FeCl 3 溶液，蒸干其水分并灼烧得到的固体可能是___。 (3)在配制FeCl 3 溶液时，为防止浑浊，应加入___。 (4)向FeCl 3 溶...
【单选题】On the evidence of the passage as a whole, we can say that Tom Sponson was ______.
A.
sensitive and troubled
B.
sensible and uneasy
C.
senseless and worried
D.
sensual and difficult
【单选题】Researchers investigating brain size and mental ability say their work offers evidence that education protects the mind from the brain' s physical deterioration. It is known that the brain shrinks as ...
A.
age
B.
education
C.
health
D.
exercise
【简答题】滚齿加工和插齿加工时分别需要哪些机床运动,在数控齿轮加工机床上,这些运动如何实现?
【单选题】Researchers investigating brain size and mental ability say their work offers evidence that education protects the mind from the brain's physical deterioration. It is known that the brain shrinks as t...
A.
mood
B.
high blood pressure
C.
alcohol
D.
age
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