第13题:[判断题]全OADM环网要注意避免环网自激现象的产生,没有使用的波道要空出来,不能用尾纤连接起来。
In the case of full-OADM loop network, avoid the occurrence of self-excitation of the loop network. Empty the wavelength that is not used and do not connect it with the tail fiber. (Tian Liang) A.正确 B.错误 参考答案:A 正确
第22题: [单项选择]When the writer says "and that was my hope at this point"(Paragraph 1) "my hope" may be used to mean that ______. 参考答案:D 答案解析:第一段,作者在叙述that was my hope之前,提到“they would be worrying more about the final than what I looked like”,
第29题: [单项选择]现有4种设备A、B、C、D可供选择,其寿命周期费用分别为2407万元、220万元、 2007万元、1807万元。生产率分别为810t/日、755t/13、710t/13、600t/13。试问单从系统效率中生产率这一项来比较,哪种设备的费用效率最好( ) A. A B. B C. C D. D 参考答案:C 答案解析:[解析] 本题中,A的费用效率=810÷240=3.375
B的费用效率=755÷220=3.432
C的费用效率=710÷200=3.55
D的费用效率=600÷180=3.333