五角星有______条对称轴．
五角星共有5条对称轴，过每个角的顶点都有条对称轴．
故答案为5．
常用剂量：每次1片，每日3次，空腹服用
A．usual dosage: 1 tablet, tid, to be swallowed at meal time．B．usual dosage: 1 tablet, three times a day, empty stomach．C．usual dosage: 3 tablets daily dose, empty stomach．D．usual dosage: 1 tablet single dose, three times a week．E．usual dosage: 3 tablets, three divided doses per day． 找出对应的英文：
电压中枢点
