题型:不定项选择题 下列有关化合价的说法中,正确的是 [ ]A.在NaCl和HCl里,氯元素均为﹣1价 B.在H2中,氢元素显+1价 C.一种元素在同一种化合物里,可能显不同的化合价 D.非金属元素在化合物里,一定显负价 查看答案
题型:选择题 Recently I bought an ancient Chinese vase (花瓶), _____ was very reasonable. [ ]A. which price B. the price of which C. its priceD. the price of whose 查看答案