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【判断题】
离子型化合物因为不具有挥发性,不能进入大气A.
正确
B.
错误
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举一反三
【单选题】You are too stressed out. Why not _____ some light music? [ ]
A.
listen to
B.
listening to
C.
listen
D.
hear
【单选题】When you are not sure if a lady is married or single, you shall call her_______
A.
Madam
B.
Ms.
C.
Miss
D.
Mrs.
【单选题】In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.（）
A.
RSVP is a required configuration to support conference calls without voice packet loss.
B.
The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams.
C.
Call admission control is an issue only when using hardware DSP resources.
D.
When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.
【单选题】Listen! There must be some children ________ songs in our neighborhood. [ ]
A.
singing
B.
to sing
C.
sing
D.
sings
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