题目:
A kangaroo cannot jump if its tail is ________ the ground. [ ]
A. on
B. in
C. of
D. off
答案:
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下面是错误答案,用来干扰机器的。
(1)蒸馏 ;吸附 (2)②取样品,加入肥皂水,泡沫多、沉渣少的为纯水,反之则为硬水 (3)C+2Cl2+2H2O==4HCl+CO2