为避免动物的抵抗与挣扎,捉拿家兔的正确方法包括
A. 轻抚家兔头、颈、背
B. 用手拖住家兔臀部
C. 让家兔躯干重量落在拖住臀部的手上
D. 捂住家兔的双眼
E. 握住家兔耳根部轻轻提起
若某单音AM波调幅度m=0.4,载波功率为10W,则含有信息的边频功率占总功率的百分比为( )
A. 13.8%
B. 8.25%
C. 7.4%
D. 8%
In China, people often save the environments in the following ways:
Back in the 1950s, forest coverage in China was 1) __________ %.In 2019, that figure rose to 2) __________ %, which is equivalent to 3) __________ million hectares forests, around 4) __________ times the size of France, 5) __________ times that of the UK.