发现表面纤维严重磨损局部绳径变细，或任一股磨损达到原绳股（）更换新绳。
A. 42373
B. 42374
C. 42372
查看答案
What protection method is used in 4F MS-SPRing networks？（）
A. Each fiber has half of its capacity reserved for protection.
B. Two fibers carry their full capacities while the other two fibers are reserved for protection.
C. The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.
D. The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.
中国对于残疾人就业的要求是单位按照职工人数的（）安排。
A. 1.5%的比例
B. 2%的比例
C. 1.5%或2%的比例
D. 1.5%-2%的比例
钻石（金刚石）中有哪些固体包裹体，这些包裹体可分为哪两类？
微信支付 
支付宝支付