多项选择题

下列( )淋巴细胞来源于骨髓。 A.
T B.
B C.
K D.
NK

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头围是通过眉间和枕骨粗隆测量的头颅周径

答案：正确

多项选择题

下列属于对正手发旋转球技术描述正确的是：（）。Which of the following texts describe forehand spin serve correctly? ( )
A、击球前选好站位，身体离球台约50cm。Before hitting, choose a proper position, about 50 cm away from the table.
B、击球前执拍手对侧脚在前，执拍手同侧脚在后，重心稍降低，双膝微屈。Before hitting, the left foot is in front while the right one is in behind (Right-handed player). Lower the body weight slightly, and bend the knees slightly.
C、击球前球置于非执拍手掌心，手的位置与球台平行或高于球台。Before hitting, the ball is placed on the palm of your free hand. The hand shall be parallel to or higher than the table.
D、击球时，需要注意引拍和挥拍击球两个过程。When hitting, pay attention to backswing and swing.