磁力线是起始于N极而终止于S极的闭合曲线，磁力线互不相交。
参考答案：对
In relation to insolvency law and the Companies Act 1965:
(a) State any THREE persons who may present a petition for the winding up of a company by the court. (3 marks)
氨基糖苷类药物中过敏性休克发生率最高的是（）
A.庆大霉素
B.链霉素
C.新霉素
D.卡那霉素
E.妥布霉素
