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【单选题】
找平层宜采用水泥砂浆或水泥混凝土铺设。当找平层厚度小于()时,水泥砂浆做找平层;当找平层厚度不小于()时,细石混凝土做找平层A.
30mm,40mm
B.
20mm,400mm
C.
40mm,40mm
D.
30mm,30mm
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举一反三
【简答题】课堂讨论: 2. How can we more effectively enlarge our vocabulary?
【单选题】When scientists first warned in the 1970s that CFCs could attack ozone, the U.S. responded by banning their use in spray cans. But the rest of the world continued to use CFC - based aerosol cans, and ...
A.
Because the CFCs directly damage the people’s health.
B.
Because the CFCs are poisonous chemicals.
C.
Because the production of the CFCs costs a lot.
D.
Because the CFCs can attack ozone by liberating atoms of chlorine.
【单选题】Electricity is used ___________heating and lighting and it is also used _________provide power ___________ machines.
A.
for, to, for
B.
for, for, for
C.
to, to, to
D.
to, to, with
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