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【多选题】
下列关于根面龋的说法中正确的有( )A.
多见于老年人
B.
牙龈退缩、根面外露者多见
C.
与老年人唾液腺萎缩，唾液分泌量减少有关
D.
产生根面龋的菌群和釉质龋是一样的
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反馈参考答案：
举一反三
【单选题】The hardware address of a computer on a LAN can also be called a MAC address because ().
A.
Hardware address is the address used in the media access control layer when transmitting data.
B.
It is the address. MAC is the abbreviation of physical address.
C.
It is the physical layer address, and MAC is the abbreviation of the physical layer.
D.
It is the link layer address, and MAC is the abbreviation of link layer.
【简答题】2018年,农村贫困人口减少_ 万人,贫困发生率下降至_。
【单选题】In the following descriptions about MAC address, which one is not correct? ( )
A.
The MAC address is the address of one node’s adapter.
B.
No two adapters have the same MAC address.
C.
The MAC address doesn’t change no matter where the adapter goes.
D.
MAC address has a hierarchical structure.
【单选题】A socket is composed of two addresses:(72)。
A.
MAC address and IP address
B.
MAC address and port address
C.
port number and IP address
D.
E-mail address and IP address
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