大比例尺地形图可用一幅图的西南角坐标公里数来()。
参考答案:编号
I think it ________that she should be knowledgeable about computers for her present job.[ ]
A.urgent
B.normal
C.essential
D.gifted
进料中易挥发含量越大,精馏过程所需的最少理论板数()。