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【多选题】
网络时间协议(NTP)在因特网得到广泛使用,具有精度高、鲁棒性好和易扩展等优点。但是它依赖的条件在传感器网络中难以满足,因而不能直接移植运行,主要是由于以下哪些因素影响
A.
NTP协议应用在已有的有线网络中，它假定网络链路失效的概率很小，而传感器网络中无线链路通信质量受环境影响较大，甚至时常通信中断。
B.
NTP协议的网络结构相对稳定，便于为不同位置的结点手工配置时间服务器列表，而传感器网络的拓扑结构动态变化，简单的静态手工配置无法适应这种变化。
C.
NTP协议中时间基准服务器间的同步无法通过网络自身来实现，需要其他基础设施的协助。传感器网络中有些应用无法得到基础设施支持。
D.
NTP协议需要通过频繁交换信息，来不断校准时钟频率偏差带来的误差，并通过复杂的修正算法，而传感器网络存在资源约束，必须考虑能量消耗。
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参考答案：
举一反三
【多选题】When you are writing a letter to your new customer, you may think about the following factors_______.
A.
Is your message concrete?
B.
Is your message concrete?
C.
Does the customer really want to buy your product?
D.
Does the customer really want to buy your product?
E.
When will the customer reply
F.
When will the customer reply
G.
Have you used specific and definite terms in making an offer or requiring a response?
H.
Have you used specific and definite terms in making an offer or requiring a response?
I.
Is your message concrete?
J.
Does the customer really want to buy your product? K. When will the customer reply L. Have you used specific and definite terms in making an offer or requiring a response?
查看完整题目与答案
【多选题】When you are writing a letter to your new customer, you may think about the following factors ______.
A.
Is your message concrete
B.
Dose the customer really want to buy your product?
C.
When will the customer reply
D.
Have you used specific and definite terms in making an offer or requiring a response?
查看完整题目与答案
【单选题】遗传密码的摆动性正确含义是
A.
一个密码子可以代表不同的氨基酸
B.
密码子与反密码子可以任意配对
C.
一种反密码子能与第三位碱基不同的几种密码子配对
D.
指核糖体沿着 mRNA 从 5 ' 端向 3 ' 端移动
E.
热运动所导致的 DNA 双螺旋局部变性
查看完整题目与答案
【判断题】《建筑施工高处作业安全技术规范强制性条文》规定，作业人员应从规定的通道上下，不得在阳台之间等非规定通道进行攀登，但可以利用吊车臂架等施工设备进行攀登。
A.
正确
B.
错误
查看完整题目与答案
【单选题】制作胶冻汁、浇上胶冻汁、最后( )。
A.
撒上番芫荽即好
B.
扣在盘内即好
C.
浇上胶冻汁即好
D.
放入冰箱冷却
查看完整题目与答案
【单选题】污染物生物净化的效果与入渗水在地下的停留时间有关，停留时间越长则净化效果越好。地下水位距渗透面大于()比较适合雨水下渗。
A.
50cm
B.
100cm
C.
75cm
D.
80cm
查看完整题目与答案
【判断题】作业人员应从规定的通道上下，不得在阳台之间等非规定通道进行攀登，也不得任意利用吊车臂架等施工设备进行攀登。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】When writing your resume, state your salary requirements
A.
正确
B.
错误
查看完整题目与答案
【单选题】污染物生物净化的效果与入渗水在地下的停留时间有关,停留时间越长则净化效果越好。地下水位距渗透面大于( )比较适合雨水下渗。
A.
50mm
B.
75mm
C.
80mm
D.
100mm
查看完整题目与答案
【多选题】Which ways are beneficial for your creative writing when you already have had ideas?
A.
Write them down immediately.
B.
Review your own writing and rewrite part of it.
C.
Lie down in a sofa without thinking and writing.
D.
Combine creativity with sense, prompts, memory, etc.
查看完整题目与答案
相关题目：
【多选题】When you are writing a letter to your new customer, you may think about the following factors_______.
A.
Is your message concrete?
B.
Is your message concrete?
C.
Does the customer really want to buy your product?
D.
Does the customer really want to buy your product?
E.
When will the customer reply
F.
When will the customer reply
G.
Have you used specific and definite terms in making an offer or requiring a response?
H.
Have you used specific and definite terms in making an offer or requiring a response?
I.
Is your message concrete?
J.
Does the customer really want to buy your product? K. When will the customer reply L. Have you used specific and definite terms in making an offer or requiring a response?
查看完整题目与答案
【多选题】When you are writing a letter to your new customer, you may think about the following factors ______.
A.
Is your message concrete
B.
Dose the customer really want to buy your product?
C.
When will the customer reply
D.
Have you used specific and definite terms in making an offer or requiring a response?
查看完整题目与答案
【单选题】遗传密码的摆动性正确含义是
A.
一个密码子可以代表不同的氨基酸
B.
密码子与反密码子可以任意配对
C.
一种反密码子能与第三位碱基不同的几种密码子配对
D.
指核糖体沿着 mRNA 从 5 ' 端向 3 ' 端移动
E.
热运动所导致的 DNA 双螺旋局部变性
查看完整题目与答案
【判断题】《建筑施工高处作业安全技术规范强制性条文》规定，作业人员应从规定的通道上下，不得在阳台之间等非规定通道进行攀登，但可以利用吊车臂架等施工设备进行攀登。
A.
正确
B.
错误
查看完整题目与答案
【单选题】制作胶冻汁、浇上胶冻汁、最后( )。
A.
撒上番芫荽即好
B.
扣在盘内即好
C.
浇上胶冻汁即好
D.
放入冰箱冷却
查看完整题目与答案
【单选题】污染物生物净化的效果与入渗水在地下的停留时间有关，停留时间越长则净化效果越好。地下水位距渗透面大于()比较适合雨水下渗。
A.
50cm
B.
100cm
C.
75cm
D.
80cm
查看完整题目与答案
【判断题】作业人员应从规定的通道上下，不得在阳台之间等非规定通道进行攀登，也不得任意利用吊车臂架等施工设备进行攀登。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】When writing your resume, state your salary requirements
A.
正确
B.
错误
查看完整题目与答案
【单选题】污染物生物净化的效果与入渗水在地下的停留时间有关,停留时间越长则净化效果越好。地下水位距渗透面大于( )比较适合雨水下渗。
A.
50mm
B.
75mm
C.
80mm
D.
100mm
查看完整题目与答案
【多选题】Which ways are beneficial for your creative writing when you already have had ideas?
A.
Write them down immediately.
B.
Review your own writing and rewrite part of it.
C.
Lie down in a sofa without thinking and writing.
D.
Combine creativity with sense, prompts, memory, etc.
查看完整题目与答案
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