石灰是()。 ["A、CaO","B、CaCO3","C、Ca(OH)","D、CaC"] 烧结普通砖：抗风化性能合格的砖，按照尺寸偏差、外观质量、泛霜和石灰爆裂等项指标划分为()等级 ["A、优等品(A)","B、一等品(B)","C、合格品(C)","D、等外品(D)"] 定形密封材料按密封机理的不同可分为()和两类。 ["A、PVC门窗密封","B、密封条带","C、遇水膨胀型","D、遇水非膨胀型","E、白粘性橡胶"] 患急性风湿性心脏炎，急性期卧床休息应为： ["A、血沉正常2周逐渐增加活动量","B、风湿热活动征象消失立即增加活动量","C、临床表现消失，血沉正常，严格卧床2月后","D、风湿活动征象消失，血沉正常3-4周逐渐活动","E、关节不痛即可活动"] 硅酸盐水泥及普通水泥的技术性质有() ["A、细度","B、凝结时间","C、体积安定性","D、水化热和碱含量","E、微膨胀性"] 矿渣水泥与硅酸盐水泥、普通水泥相比具有以下特性〔〕