A. destructive B. embarrassed C. unstable D. casual
A. hardly B. nearly C. simply D. approximately
A. or B. unless C. but D. since
A. get in touch with B. get close to C. get a hold of D. get away from
A. 空气滤过散射少 B. 照射野小清楚度髙 C. 将髙频信号转换成低频信号 D. 焦点面积变小 E. 模糊阈值变大
微信支付 
支付宝支付