She ____________ a big mouth. [ ]
A. has
B. is
C. are
答案:A
煤样达到空气干燥状态的标志是,煤样在空气中(),其质量变化()
移动通信场强预测用数字地图必须包含下列()内容。
A.DEM
B.DOM
C.LDM
D.BDM