热力管道一般采用（）敷设或（）敷设，不采用（）敷设。
参考答案：架空；地沟；埋地
In relation to the Company Law of China:
(b) state the reasons why a joint stock company is generally not allowed to purchase its own shares, except under special circumstances. (4 marks)
噻吗洛尔属于
A．α受体阻断药B．β受体阻断药C．α,β受体阻断药D．α1受体阻断药E．β1受体阻断药
