亚洲分布最广的气候类型是()
A.温带大陆性气候
B.热带季风气候
C.热带沙漠气候
D.地中海气候
参考答案:A
_______, babies begin to talk between 12 and 15 months, but they can use body language to
communicate before they begin to speak. [ ]
A. In common
B. In particular
C. In general
D. In public
声波透射法检测时,增大声波频率,有利于()。
A、增强对缺陷的分辨率
B、延缓声波的衰减
C、增大声波的探测距离
D、提高信号的信噪比