通过选择不同规格的终端接头，用来（）仪表各系统的测量管路，液压管路或其它管路。
A、规范
B、适配
C、统一
D、保护
参考答案：B
瓦斯涌出不均衡系数是最大绝对瓦斯涌出量与相对瓦斯涌出量的比值。
You hear on the radiotelephone the word “Securite” spoken three times. This indicates that（）.
A.a message about the safety of navigation will follow
B.a message of an urgent nature about the safety of a ship will follow
C.the sender is in distress and requests immediate assistance
D.you should secure your radiotelephone
