光纤连结器主要实现设备、仪器、光纤等相互()连接
A.永久性固定
B.非永久性固定
C.不固定
D.跳跃
参考答案:B
根据汉语提示完成句子。
1. This girl's handwriting is fine beyond _____ (文字描述).
2. _____ (什么课程) are you interested in best?
3. We have classes from _____ to _____ (星期一至星期五).
4. I _____ (相信) you will get on well with your classmates.
5. My physics teacher gives us _____ (几个例子) to explain what heat is.
变质程度最深的是()煤,其次是()煤。