皮皮学，免费搜题
登录
搜题
【多选题】
以下关于电子邮件服务的描述中,正确的是()。A.
电子邮件是早期出现的服务类型
B.
电子邮件的邮件发送协议是SMTP
C.
电子邮件的邮件接收协议是SNMP
D.
电子邮件服务采用P2P工作模式
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Do you find getting up in the morning so difficult that it is painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Duri...
A.
Unawareness of energy cycles.
B.
Familiar monologues.
C.
A change in a family member's energy cycle.
D.
Attempts to control the energy cycle of other family member.
【单选题】Do you find that getting up in the morning is so difficult that it's painful? This might be called laziness, but Dr. Newman has a new explanation. He has proved that everyone has a daily energy cycle....
A.
he is a lazy person
B.
he refuses to admit that his own energy is low
C.
he is not sure when his energy is low
D.
he is at his peak in the afternoon or evening
【单选题】Do you find getting up in the morning so difficult that it's painful? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. Durin...
A.
he is' hot'
B.
he refuses to follow his own energy cycle
C.
he is not sure when his energy is low
D.
he is very energetic in the afternoon or evening
【简答题】设计键连接的几项主要内容是： a）按轮毂长度选择键的长度； b）按使用要求选择键的主要类型； c）按轴的直径选择键的剖面尺寸； d）对连接进行必要的强度校核。 在具体设计时，一般顺序是（）
【单选题】使用（ ）修改器可以使物体表面变得光滑
A.
Face Extrude
B.
Surface Properties
C.
Mesh Smooth
D.
Edit Mesh
【单选题】设计键连接的几项主要内容是:1按轮毂长度选择键的长度;2按使用要求选择键的主要类型;3按轴的直径选择键的剖面尺寸;4对连接进行必要的强度校核。在具体的设计时,一般顺序是( )
A.
②③①④
B.
①③②④
C.
③④②①
D.
①②③④
【单选题】设计键连接的几项主要内容是:a按轮毂长度选择键的长度,b按要求选择键类型,c按轴径选择键的截面尺寸,d进行必要的强度校核。具体设计时一般顺序为______。
A.
b-d-c-a
B.
b-c-a-d
C.
a-c-b-d
D.
c-d-b-a
相关题目：