A:forming
B:to form
C:formed
D:be forming
At the beginning of the 20th century, many people thought that the family was falling apart—__________, they thought it was dying. ( )
请选用下面的词语填空,组成一幅合乎意境的对联,正确的一项是( )。
上联:帘外微风斜燕影
下联:____________近____________
如图所示,用绳AB和BC吊起一重物P处于静止状态,AB绳与水平面间的夹角为53°,BC绳与水平面的夹角为37°.(g取10m/s2sin37°=0.6,cos37°=0.8)求: