天然碳酸钡(毒重石)

The full title of the U.K. is the United Kingdom of （）and （）

填空题查看答案

天然硫酸钡(重晶石)

报关编码查看答案

天然碳酸镁(菱镁矿)

报关编码查看答案

public and private colleges and universities and community colleges offer（）.

单选题查看答案

（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.

单选题查看答案

The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.

单选题查看答案

天然石材按表观密度大小可分为重石和轻石两类，轻石主要用作（）。

单选题查看答案

Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.

单选题查看答案

Whose duty is it to examine and verify the vessel’s classification and technical state and condition?（）.

单选题查看答案