⑴____ A . name B . thank C . am D . that
⑵____ A . many B . any C . have D . face
⑶____ A . he B . she C . these D . egg
⑷____ A . desk B . England C . twenty D . dress
⑸____ A . eleven B . twelve C . we D . seven
如图,半圆O的直径在梯形ABCD的底边AB上,且与其余三边BC,CD,DA相切,若AB=10,BC=4,则AD的长( )
某人在t=0时刻时,观察一个正在做匀加速直线运动的质点,现只测出该质点在第3s内及第7s内的位移,则下列说法正确的是( )