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【单选题】
乙炔分子的三个键中含有()A.
2个σ键、1个π键
B.
1个σ键、2个π键
C.
3个σ键
D.
3个π键
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【单选题】The author tells us that to communicate effectively, we must understand ______.
A.
our audience and the situation we are in
B.
the target language and facial expressions
C.
both sign languages and verbal languages
D.
the most direct way to deliver a message
【单选题】In our society, we must communicate with people. A great deal of communicating is performed on a person-to- person【C1】______ by the means of speech. If we travel in buses, we are likely to have...
A.
basis
B.
base
C.
foundation
D.
ground
【单选题】In our society, we must communicate with other people. A great deal of communicating is performed on a person-to person【C1】______ by the means of speech. If we travel in buses, stand in footbal...
A.
basis
B.
base
C.
foundation
D.
ground
【简答题】国家标准规定:硅酸盐水泥的初凝时间不小于 、终凝时间不大于 ;普通硅酸盐水泥的终凝不大于
【单选题】In our society, we must communicate with other people. A great deal of communication is performed on a person-to-person basis by the means of speech. If we travel in buses or stand in football ...
A.
primary
B.
secondary
C.
auxiliary
D.
optional
【单选题】In our society, we must communicate with other people. A great deal of communicating is performed on a person-to-person【C1】______ by the means of speech. If we travel in buses, stand in footbal...
A.
basis
B.
base
C.
foundation
D.
ground
【单选题】Only by practicing a lot _____ our English well enough to communicate with foreigners.
A.
we can learn
B.
can we learn
C.
learn we
D.
we learn
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