【简答题】Why do governments attach great importance to the Internet?
【简答题】人体的触电类型有哪些?若发生应如何紧急处理?
【单选题】室内生活给水系统常用镀锌钢管、塑料管或铜管、_____( )_____
【多选题】触电对人体的伤害程度与哪些情况有关:().
【单选题】我国的产品质量认证工作启动于( ),质量体系认证工作始于( )。
【判断题】醇能与氢氰酸发生亲核取代反应生成相应的腈。
【单选题】Why do governments show special concern for agriculture?
A.
Because farm prices go up and down constantly.
B.
Because farmers usually earn less than other income groups.
C.
Because there is not much arable farmland left.
D.
Because farmers are confronted with fiercer competition.