对脊髓β运动神经元的描述，正确的是()

A．为前角内的大型细胞

B．可直接支配关节运动

C．与肌张力调节有关

D．轴突支配心肌、平滑肌

E．轴突支配梭外肌

（）should generally best for handing acids,alkalis,various types of oils,solvents and chemicals in general.

A.Heat-resistant gloves

B.Rubber gloves

C.PVC gloves

D.Leather gloves