6.在印刷过程中，油墨渗入纸张并在印张背面明显地见到正面印迹，这一现象称为

A.透印                                                              B.蹭脏 

C.粘脏                                                              D.重影

7.一般说来，钞票、股票、礼券、邮票都采用____印刷。

A.平版油墨                                                       B.凸版油墨 

C.凹版油墨                                                       D.特殊版油墨

8.蜡在油墨中的作用是

A.干燥作用                                                       B.使印品表面耐磨性好，印迹清晰

C.降低成本                                                       D.增稠作用

9.油墨的颜色取决于

A.连结料                                                          B.填充料

C.色料                                                              D.助剂

10.U型瓦楞的特点是

A.抗压强度大                                                   B.黏结能力差

C.黏合剂用量小                                                D.平压强度低