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【单选题】
材料的孔隙率增大时,以下性质中( )一定下降。A.
密度
B.
体积密度
C.
吸水率
D.
抗冻性
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【单选题】Choose the best answer to the following question. His explanation has ________ this mystery and helped us to understand better.
A.
surrendered
B.
torn
C.
surveyed
D.
clarified
【单选题】This story of the development of a gunshot-locating system shows ______.
A.
scientific development can greatly enrich people's life.
B.
scientific concepts are too abstract for people to understand.
C.
scientific knowledge is a great stimulus to economic development.
D.
scientific research in one field can aid society in an unrelated area.
【简答题】His car broke ______, so he has a plausible explanation as to why he is late.
【单选题】The passage is mainly about _______
A.
the characteristics of American newspapers
B.
the development of American newspapers
C.
the functions of American newspapers
D.
the merits and shortcomings of American newspapers
【单选题】His car broke ______, so he has a plausible explanation as to why he is late.
A.
out
B.
off
C.
down
D.
in
【单选题】Choose the best answer to the following question. 14) His explanation has ________ this mystery and helped us to understand better.
A.
surrendered
B.
torn
C.
surveyed
D.
clarified
【单选题】建筑物防雷分类是按照建筑物的重要性、生产性质、遭受雷击的可能性和严重性进行的。在建筑物防雷类别的划分中，电石库应划分为______防雷建筑物。
A.
第一类
B.
第二类
C.
第三类
D.
第四类
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