Explain how directors, company offi cers and other persons may be liable for insider trading offences under the Securities and Futures Act (Cap 289). (10 marks)

混凝土宽枕垫碴起道作业，由于一次垫碴量不易掌握，所以应采用多次重复垫碴起道办法，以整平轨面坑洼。