皮皮学，免费搜题
登录
搜题
【单选题】
下列关于氰聚塑直埋保温管保温层的说法错误的是( )。A.
保温层材料是硬质聚氨酯泡沫塑料
B.
硬质聚氨酯泡沫塑料是一种热固性泡沫塑料，在化学反应过程中能形成无数微，体积膨胀几十倍，同时固化成硬块
C.
硬质聚氨酯泡沫塑料具有密度小，导热系数大，率高，抗压强度比其他泡沫塑料高，耐温性能比其他泡沫塑料强等优点，并具有良好的耐水、耐化学腐蚀、耐老化等性能
D.
聚氨酯泡沫塑料根据原料不同和不同配方可制成软质、半硬质、硬质、开、闭、高弹性等多种不同性质的泡沫塑料
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】Complete each blank with words below. Use each word only once. (1 point for each) recycle floats collect solution causes aware throws away report kills clean up Some experts _...
【简答题】Choose a word or phrase from the following (reflection, reflect, relected, reflect on, reflective) to complete each blank: He saw himself _____ in the water/mirror/shop window. The statistics _____ a ...
【简答题】(题干) 患者女，41岁。半小时前被车撞伤，主诉左胸剧烈疼痛、胸闷、呼吸困难。查体：口唇发绀，左下胸壁反常呼吸。造成患者呼吸困难的主要原因是 A.疼痛限制呼吸运动 B.胸壁反常呼吸运动 C.气胸 D.血胸 E.肺挫伤 急诊室急救处理应首先采取 A.气管切开或气管插管 B.胸壁切开内固定肋骨 C.胸壁加压包扎 D.胸壁牵引 E.胸腔闭式引流术 的正确答案和分析，谢谢！
【简答题】Choose a word from the following (heritage, appropriate, inappropriate, initial, initials) to complete each blank: 1) I didn't think his comments were very ______ at the time. 2) She thought we were _...
【简答题】患者女，41岁。半小时前被车撞伤，主诉左胸剧烈疼痛、胸闷、呼吸困难。查体：口唇发绀，左下胸壁反常呼吸。造成患者呼吸困难的主要原因是A、疼痛限制呼吸运动 B、胸壁反常呼吸运动 C、气胸 D、血胸 E、肺挫伤 急诊室急救处理应首先采取A、气管切开或气管插管 B、胸壁切开内固定肋骨 C、胸壁加压包扎 D、胸壁牵引 E、胸腔闭式引流术
【简答题】Complete each blank with words below. Use each word only once. (1 point for each) images received organizations painting create deal with proud materials 1. People need to see _______ of The Great Pac...
【简答题】Choose a word from the following (occupy, occupied, occupants, occupation) to complete each blank: He returned to his previous ______ as a teacher. The rest of the time was ______ with writing a repor...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
