3 4 7 16 ()
A.23B.27C.39D.43
参考答案:D
I need my hat, my notebook and a pen. Can you _________ them to me? [ ]
A. have
B. help
C. bring
D. take
将一定量的有机物充分燃烧后的产物先通入浓硫酸,浓硫酸增重5.4g,然后通入足量澄清石灰水中,完全吸收后,经过滤得到20g沉淀,该有机物可能是 [ ]
A.乙烯
B.乙醇
C.甲酸甲酯
D.乙酸