A:Having a talk with the student
B:One talk with the student
C:Given a talk with the student
D:If you have a talk with the student
如图所示,在不计滑轮摩擦和绳子质量的条件下,当小车匀速向右运动时,物体A的受力情况是绳的拉力____A的重力.(填大于、等于或小于)
下列结构中,既能产生生殖细胞,又能分泌激素的是( )