疏水器
春秋时秉笔直书“赵盾弑其君”的史官是（） ["董狐","南史氏","史墙","齐太史"]
简述泵送混凝土技术要求。
We should appreciate it if you would quote your best prices C.I.F. New York for the envelope openers （） in China Daily. ["advertising","advertise","advertised","advertise"]
机舱排水应急吸口阀平时保养的主要内容是（） ["清洁与放水试验","所接泵运行中加油活络","所接泵停止加油活络","反向放水冲洗"]
举例说明什么是简化字？是不是笔画少的字就是简化字？
