请问下列哪一种不是常用的光纤接口().
A.LC
B.PC
C.SC
D.ST
参考答案:B
If you intend to arouse students’ interest in your project, you’d better ______ your teaching methods more wisely.
A.enjoy
B.encourage
C.enrich
D.employ
携带型短路接地线成组直流电阻试验应每年进行一次。