He wasn't ______ with the knife. He cut himself.
A:careful enough
B:enough careful
C:carefully enough
D:enough carefully
我加上1就是最小的四位数,我是____。
My students,________you have a heart loving life,you always can find things that would make you happy each day.
如图所示,质量不计的绳将质量为m的球挂在竖直墙上,球静止时绳与墙的夹角为θ,不考虑球与墙间的摩擦,重力加速度用g表示,请用上述各量表示: