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【单选题】
关于轮胎胎面花纹深度,下列说法不A的是A.
轮胎胎面花纹深度过浅,容易爆胎。
B.
轮胎胎面花纹深度过浅,会使汽车操纵稳定性变坏。
C.
轮胎胎面花纹深度过浅,会使车轮发生水滑的可能性变大。
D.
轮胎胎面花纹深度过浅时,翻新处理。
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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
【多选题】What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）
A.
codec
B.
link speed
C.
Layer 2 encapsulation
D.
packet overhead （IP/UDP/RTP）
E.
link delay
F.
total number of simultaneous calls that are allowed
【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】关于霍乱肠毒素,叙述正确的是
A.
A亚单位与细胞受体结合
B.
B亚单位进入细胞发挥毒性作用
C.
激活鸟苷酸环化酶，使cGMP升高
D.
其受体是GM1神经节苷脂
E.
耐热外毒素致病
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