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【判断题】
该阀X和Y中至少有一个进气,则A出气。A.
正确
B.
错误
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【单选题】【习题10】某蓄水池有一进水口A和一出水口B,池中无水时,打开A口关闭B口,加满整个蓄水池需2小时;池中满水时,打开B口关闭A口,放干池中水需1小时30分钟。现池中有占总容量 的水,问同时打开A、B口,需多长时间才能把蓄水池放干?( )
A.
90分钟
B.
100分钟
C.
110分钟
D.
120分钟
【单选题】The ONS 15216 is a 32-channel system. The ONS 15216 OADMs are capable of adding and dropping one， two， or four channels. How are the OADMs provisioned to add and drop specific channels？（）
A.
The ONS 15216 OADM can be provisioned to add/drop one， two， or four channels via Cisco Transport Manager （CTM）.
B.
The ONS 15216 OADM consists only of a four-channel module， and the number of ports utilized determines whether it is a one， two， or four channel OADM.
C.
Three separate OADM modules are available for one， two， and four channels. The wavelengths to be dropped and added are programmable via Cisco Transport Manager （CTM）.
D.
The ONS 15216 OADM consists only of a single-channel module. Two-channel and four-channel support is available by stacking the single-channel module.
E.
The ONS 15216 OADM is available in one， two， four channels. There are 32 single-channel OADM modules， 16 two-channel OADM modules， and 8 four-channel OADM modules.
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