禁止利用内河以及其他封闭水域等航运渠道运输剧毒化学品以及国务院交通部门规定禁止运输的其他危险化学品。
参考答案：对
----Is that Jack speaking?
----Sorry, he isn’t in right now. He ________ the park with his mother.
A. have been to B. has gone to C. has been to
仪器检修中，用等效代替法就是用（）去代替电路中（）的元器件。
