涂防锈油时，应在隔爆面上形成一层薄膜为宜，涂油过多为不完好；油不得干硬，油中不得有机械性杂物或其他颗粒状杂物（油脏为失爆）。（）

Chu, a suitably qualified person, was appointed as the company secretary of Do plc. Since his appointment, Chu has entered into the following contracts in the name of Do plc:(a) an extremely expensive, long-term contract with Ex plc for the maintenance of Do plc’s photocopiers;(b) an agreement to hire a car from Far plc which Chu used for his own, non-business related purposes;(c) an agreement with Gro plc to landscape the garden of his, Chu’s, personal house.The directors of Do plc have only recently become aware of these contracts.Required:In the context of company law, with specific regard to the authority of company secretaries, advise the directors of Do plc whether the above agreements are binding on the company. (10 marks)