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【单选题】
以石墨为原料，先制备氧化石墨，再经过热还原可制备石墨烯．石墨烯硬度大，导电性能好，有韧性，可弯曲．下列关于金刚石、石墨、C 60 和石墨烯四种单质的叙述错误的是（ ）A.
将石墨变成石墨烯发生了化学变化
B.
四种物质中碳原子的排列方式不同
C.
四种物质完全燃烧后的产物都是CO 2
D.
石墨烯是一种新型的化合物
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举一反三
【单选题】We must take part in physical labor in order to ______ ourselves more closely with the working people.
A.
identify
B.
incorporate
C.
combine
D.
involve
【简答题】计算二重积分xInydxdy，其中D：0≤x≤4，1≤y≤e．
【单选题】We all know that programming language is the system of syntax, grammar, and symbols or words used to give instructions to a computer. Because computers work with binary numbers, first-generation langu...
A.
it is used in designing software.
B.
it is hardware-independent.
C.
is should be translated into the computer language by software.
D.
it is designed to solve some specific problem.
【简答题】计算二重积分 ，其中D＝{(X，y)1 0≤X≤1，0≤y≤1}．
【简答题】计算二重积分 ，其中D＝{(x，y)｜0≤x≤1，0≤y≤1)．
【单选题】So far we have done a lot to build a low-carbon economy, but it is ____ ideal (理想). We have to work still harder.
A.
next to
B.
far from
C.
out of
D.
due to
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