垫片是法兰连接时起密封作用的材料,垫片的种类很多,适用于输送各种腐蚀性较强的管道的法兰连接的是()垫片。
A.橡胶石棉
B.缠绕式
C.齿形
D.塑料
参考答案:D
小题1:It’s a huge ________ (荣誉) to be invited to attend the opening ceremony of the city games.
小题2:I bought a toy car for my son’s ____________ (第九) birthday.
小题3:Everybody knows that air in the country is of course rather ____________ (新鲜).
小题4:Learning Chinese is very popular ____________ (在……之间) foreigners now.
小题5:I would rather ____________ (记录) what you said than write it down by myself.
为了建设一支()的现役军官队伍,以利于人民解放军完成国家赋予的任务,特此臸定了†中华人民共和国现役军官法‡。
A、革命化
B、年轻化
C、知识化
D、专业化