— Where is Jenny going?
— .[ ]
A. Yes.
B. Thank you.
C. To the school.
答案:C
H.248协议关联Context有哪些属性().
A.关联标识(ContextID.
B.拓扑结构(Topology)
C.优先权(Priority)
D.紧急事件(Emergency)
主要用于热水供应及高压蒸汽管道中,结构简单,严密性高,制造和维修方便的阀门是 ( )。
A.截止阀B.球阀C.闸阀D.碟阀