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【简答题】
将8.8g FeS固体置于200mL 2. 0 mol·L-1的盐酸中，以制备H2S气体。反应完全后，若溶液中H2S的浓度为0.10 mol·L-1，假定溶液体积不变，试计算： （1）收集到的H2S气体的体积（标准状况）。 （2）溶液中Fe2+和H+的物质的量浓度（摩尔浓度）。
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举一反三
【单选题】听力原文：There are three kinds of things you need to learn if you want to be able to communicate effectively with Westerners. First, you need to learn a foreign language, usually English. Second, you shou...
A.
Cultural differences and communication.
B.
Language and communication.
C.
Intercultural communications.
D.
Three prerequisites of successful communication between cultures.
【单选题】There is no need for you to look up every new word you ______ when reading. You have to learn how to guess the meanings of new word according to the context.
A.
come up with
B.
come out
C.
come along with
D.
come across
【简答题】When you come to Japan, you need to learn some rules for eating. They aren't difficult to learn. If you eat something with the Japanese, you can hear them say 'itadaki-masu'. This is to show thanks fo...
【单选题】Mum，you really need to have a rest！You ________in the kitchen ever since you came back home three hours ago.
A.
had worked
B.
were working
C.
have been working
D.
worked
【单选题】Studying alone, you are free to choose what to learn and when, ____ you don’t need others’ agreement.
A.
while
B.
if
C.
though
D.
as
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