参考答案:A
Optical surge: it tends to threaten the security of human being and optical modules; Non-linear effect: ultra-large power is opt to cause four wave mixing effect and reduce the signal to noise ratio. Bandwidth: the bandwidth of EDFA restricts bandwidth extension of DWDM system. Dispersion: EDFA only amplifies optical power but dispersion, hence failing to solve the dispersion problem.
第12题: [单项选择]交付规范适用于下列哪一种情况()
A. 信息系统审计
B. 需方评价和选择供方
C. 评价供方的服务能力
D. 指导供方管理服务交付
参考答案:D
第13题: [单项选择]桡神经沟位于()。
A. 尺骨
B. 锁骨
C. 肱骨
D. 肩胛骨
E. 桡骨
参考答案:C
答案解析:
桡神经沟位于肱骨体。在三角肌粗隆后下方,肱骨干上有一自内上向外下呈螺旋的浅沟,称桡神经沟.
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