关税的征税对象是准许进出境的货物和物品。货物是指贸易性商品；物品包括入境旅客随身携带

下列有关叙述正确的是

A．氢键是一种特殊化学键，它广泛地存在于自然界中

B．在分子中含有1个手性C原子

C．碘单质在水溶液中溶解度很小是因为I₂和H₂O都是非极性分子。

D．含氧酸可用通式XOm(OH)n来表示，若n值越大，则含氧酸的酸性越大

从水龙头中流出的水，水速是______________（上方、下方）的大，原因是______________________ 。

下述关于呋喃丹口服中毒的叙述错误的是（）

A.作用快

B.恢复快

C.对红细胞胆碱酯酶的亲和力小于血清胆碱酯酶

D.毒性作用范围较宽，相对安全

E.一般不引起迟发性脑病

基础教育课程改革关于学习方式改革倡导学生的学习方式由自主学习转向他主学习。

What of the following is true of Lesley a. He was charged of committing fraud and is under a probe led by some officials. b. Some officials cooperated with the prosecutors to force him to plead guilty. c. He was charged of taking bribes as an official. d. Some officials are involved in the corruption scandal that is being investigated with the help of him.