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【多选题】
下列有关中国饮食文化的历史发展过程,描述正确的有( )A.
用火加工食物是人类饮食文化的起点
B.
青铜器的发明是烹饪技术的第一次飞跃，人类真正进入了烹饪时代
C.
中国烹饪经历了夏商周的“铜烹时期”、西汉以后的“铁烹时期”
D.
发展到现在，烹饪工艺不断改进和完善，形成了富有中国特色的风味体系
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【单选题】Rampart Hospital has total variable costs of 90% of total revenues and fixed costs of $50 million per year. There are 50,000 patient-days estimated for next year. What is the average daily revenue per...
A.
a. $1,000 is the average daily revenue per patient necessary to breakeven.
B.
b. $4,000 is the average daily revenue per patient necessary to breakeven.
C.
c. $250 is the average daily revenue per patient necessary to breakeven.
D.
d. $10,000 is the average daily revenue per patient necessary to breakeven.
【判断题】The average daily consumption of Phosphorus by adults is 1,200 to 1,600 milligram.
A.
正确
B.
错误
【单选题】The average daily volume of foreign exchange trading in all locations in 2013 was approximately equal to
A.
$5,000 billion.
B.
$100 million
C.
$15 million.
D.
$750,000 .
【单选题】600 out of 800 rooms have already been booked, and the revenue for the day is 72000 dollars, what is the average daily rate?
A.
90 dollars
B.
480 dollars
C.
120 dollars
D.
60 dollars
【单选题】压力容器用钢的基本要求是有较高的强度，良好的塑性、韧性、制造性能和与介质相容性，硫和磷是钢中最有害的元素，我国压力容器对硫和磷含量控制在()以下。
A.
0.2%和0.3%;
B.
0.02%和0.03%;
C.
2%和3%;
D.
0.002%和0.003%。
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