关于帕金森病的3个主要体征，哪项是正确的（）
【单选题】
地高辛治疗心房纤颤的主要作用是
A.
直接降低心房的兴奋性
B.
降低浦肯野纤维的自律性
C.
减慢房室传导
D.
缩短心房有效不应期
E.
抑制窦房结
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参考解析
【单选题】
Until recently, body heat has caused problems because it _____.
was difficult to collect
came in a variety of forms
was difficult to get rid of
tended to be absorbed by physical objects
【单选题】
EPON和APON的主要区别：在EPON中，根据IEEE 802.3以太网协议的规定，传送的是可变长度的数据包，最长可为1518个字节；在APON中，根据ATM协议的规定，传送的是包含48个字节净负荷和5个字节信头的53个字节固定长度信元。（）
错
对
【单选题】
Which of the following statements about a lesson plan is inappropriate?
It is a teaching guide
It is a blueprint to be strictly followed
It takes into account syllabus and students
It describes in advance what and how to teach
【单选题】
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There are also companies like Acquisio, which analyzes advertising performance across multiple channels like Adwords, Bing and social media and makes adjustments or suggestions about where advertising funds will yield best results.
You want to predict if something needs attention now and point to where it’s useful for employees to go to.
Before, they might not insure the ones who felt like a high risk or charge them too much,or they would charge them too little and then it would cost the company money.
We’re also giving our customers better channels versus picking up the phone to accomplish something beyond human scale.
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