直径d=1.5m的圆柱形滤水器,滤水层由均匀砂组成,厚1.5m,渗透系数k=0.013cm/s,求在hw=0.6m的恒定流情况下,滤水器的渗流流量Q。
DVGA单元共有()个TX输入端口 ["1个","2个","3个","4个"]
获得子字符串的方法有Mid函数和String.SubString方法,前者的索引从1开始,后者的索引从()开始;
Examine the following parameter settings from an initialization (init.ora) file: DB_CREATE_FILE_DEST =’/u01/oradata/’ DB_CREATE_ONLINE_LOG_DEST_1 =’/u02/oradata/’ DB_CREATE_ONLINE_LOG_DEST_2 =’/u03/oradata/’ If you create an Oracle Managed Files (OMF) database using these settings, what is the result?() ["A","B","C","D"]
置换原子的固溶度可以较大,而间隙原子的固溶度很小。() ["是","否"]
计算机的存储器分为()和()两级。