磨口试剂瓶不宜贮存()试剂和()溶液。
参考答案:碱性;浓
There are _____________ months with _____________ days in a year.[ ]
A. twelve, thirty-one
B. four, thirty
C. seven, thirty
D. eight, thirty-one
监理实施细则应在( )编制完成。
A.签订监理合同后10天内
B.相应工程施工开始前
C.工程项目正式开工前
D.工地第一次工地例会前