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【单选题】
GY/T221-2006《有线数字电视系统技术要求及测量方法》中要求，电视节目切换时不能出现严重的马赛克、长时间黑屏，用户平均等待时间应小于（），最大不超过3.5s。A.
1.5s
B.
2s
C.
2.5s
D.
3s
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举一反三
【单选题】A unique selling proposition is a feature of a product that ______.
A.
attracts consumers in the market
B.
is highlighted in advertisements
C.
satisfies customer needs
D.
makes it different from other similar products
【单选题】The unique feature of geriatric nursing in Germany is:
A.
Home-based care services
B.
Attach importance to the "surplus capacity" and "personal needs" of the elderly, forming personalized care plan.
C.
Care for kids not for aging
D.
Complete the international qualification certification quickly.
【简答题】The Air Waybill is the most important document in air cargo transportation．It serves as（ ）．
【单选题】Which of the following pictures best tells the movements of warm air and cold air?
A.
B.
C.
D.
【简答题】What is the unique feature of Chinese food?
【多选题】The Air Waybill is the most important document for a batch of air cargo transportation. It serves as( )．
A.
receipt and delivery of shipment
B.
evidence of contract of air cargo transportation
C.
customs declaration
D.
document of title
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