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【简答题】
Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show ________ those who ________ along reolvutionary paths. Such people, with their new ideas and practices _______ the national experience. (enrich, strike out, tolerance)
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举一反三
【单选题】将浓度为0.40mol·L -1 HAc溶液与0.20mol·L -1 NaOH溶液等体积混合，其溶液的pH为（K a =1.8×10 -5 ）（）。
A.
4.3
B.
4.5
C.
4.7
D.
5.1
【单选题】将浓度为5 mol·L?1NaOH溶液100 mL，加水稀释至500 mL，则稀释后的溶液浓度为
A.
1 mol?L?1
B.
2 mol?L?1
C.
3 mol?L?1
D.
4 mol?L?1
【简答题】Ohm's Law states that the voltage across a resistor is the current flowing through the resistor.A. equal
to B. directly
proportional to C. inversely
proportional to D. different
from
【单选题】Ohm ’ s Law states that the voltage across a resistor is _____ the current flowing through the resistor.
A.
equal to
B.
directly proportional to
C.
inversely proportional to
D.
different from
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