1、【第48题-单选】博鳌亚洲论坛2018年年会在海南省博鳌开幕。国家主席习近平出席开幕式并发表演讲,强调各国要顺应时代潮流,坚持开放共赢,勇于变革创新,向着构建( )的目标不断迈进。

1、【第584题-判断】下列表述是否正确:Laser perforation is an issuing technique. ()

1、【第583题-判断】下列表述是否正确:Letterpress is one of the desktop printing processes. ()

1、【第582题-判断】下列表述是否正确:Metameric ink can be observed as the same colour under reflected light. ()

1、【第581题-判断】下列表述是否正确:Shadow watermark can be slightly observed under side light. ()

1、【第580题-判断】下列表述是否正确:Line watermark can be slightly observed under side light. ()

1、【第579题-判断】下列表述是否正确:Intaglio printing has the printing character of halo and squash. ()

1、【第578题-判断】下列表述是否正确:Laser printing can have tactile effects. ()

1、【第577题-判断】下列表述是否正确:Laser perforation can be used with paper substrate. ()

1、【第576题-判断】下列表述是否正确:Laser engraving can be used on paper substrate. ()

1、【第575题-判断】OVI( )在不同角度下观察只能看见同一颜色的深浅变化。