输纸装置中为什么要具备自动升纸功能？
扣件式钢管高层井架搭设时应注意哪些事项？
The sentence structure is （）. ["only linear","only hierarchical","complex","both linear and hierarchical"]
下列对班风建设策略描述不正确的是（）。 ["宜早不宜迟","宜迟不宜早","全员参与，形成共识","发挥榜样力量"]
“两个必然”和“两个决不会”（） ["是矛盾的","是两回事","是有着内在联系的","是内容和形式的关系"]
什么是变压器的空载损耗？
