治疗甲状腺危象，应首选的药物是
A．丙基硫氧嘧啶B．甲基硫氧嘧啶C．甲巯咪唑D．卡比马唑E．氢化可的松
参考答案：A
In relation to employment law, explain and distinguish between the following:
(a) a contract of service and a contract for services; (5 marks)
电抗器的作用有哪些？
