“一词多义”现象，属于影响沟通的（）障碍。 ["文化","社会","心理","认识"]
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（） ["grinding the spare plunger to the barrel","replacing the plunger and the barrel","highly polishing both the plunger and barrel","replacing plunger only"]
文书转化为档案的基本条件：办理完毕、保存价值、（）、移交归档。
新造客车穿线钢管弯曲线弯角不应小于（），弯曲半径处不应有皱折。 ["45°","60°","90°","120°"]
何为熟料的碱比、钙比、铁铝比、铝硅比？
碱―石灰烧结法和拜耳法生产氧化铝需要哪些主要原料？
