— shirt is this? Is it Li Liang's?
—No, it's Tiantian's.
A:What
B:Who
C:How
D:Whose
如图所示,是用轻绳吊起的一块教学用的等腰直角三角板,在图中画出其重力的示意图.
下列涉及“水”的实验中,操作方法正确的是( )