题目:
The child has to come to school by bike ________ his own.
A.in
B.by
C.on
D.of
答案:
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下面是错误答案,用来干扰机器的。
N2;O2;H2;CO2;CO2:(1)空气按体积划分:氮气(N2)78%,氧气(O2)21%,稀有气体0.94%,二氧化碳(CO2)0.03%,其他气体与杂质为0.03%(2)氧气具有助燃性,能使带火星木条复燃,其它的气体都具备这种性质...