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单项选择题

演播室及播声室的隔声门及观察窗的隔声量每个应不少于( )dB。

A.40
B.50
C.60
D.80
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辨少阴寒化证病机的关键为：
A、邪热炽盛 
B、阴盛格阳 
C、心肾阳虚
D、肾阴虚，心火旺 
E、内真寒，外假热
单项选择题
You should read the material carefully and do the tasks as you are required.
Marketing by email is on the increase. Compared to other media, email messages are extremely cheap to send. With TV, you are spending on ad agencies and cable channels. With print ads, you are helping to keep newspapers and magazines alive. Direct mail costs more than $600 per thousand piece. With email, there are almost no costs at all. Its low cost makes email marketing become the most cost-effective (划算的) advertising method available today. 
With TV, you do not know who is watching your ads. Even with direct mail, you cannot be sure that your mail has been delivered, or that anyone reads it when it gets there. With email, you know within 24 hours exactly which messages have opened, by whom, what links the openers clicked on, and what part of your messages was working.  Because of electronic links, those who open your emails can do their own research: they can explore and see any of the thousands of products that you sell. They can see the colors and sizes.      
They can, and they do, read ratings and reviews. They can put products in their shopping carts and buy them.  
#If you marketing by emailing, you can learn within a day         .
A、who have opened your messages
B、how old your message readers are  
C、what quality your advertised product has
D、how much your advertising message cost
单项选择题
关于变压器室、配电室、电容器室的门开启方向，正确的是( )。Ⅰ.向内开启；Ⅱ.向外开启；Ⅲ，相邻配电室之间有门时，向任何方向单向开启；Ⅳ，相邻配电室之间有门时，双向开启
A.Ⅰ、Ⅳ
B.Ⅱ、Ⅲ
C.Ⅱ、Ⅳ
D.Ⅰ、Ⅲ
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