Why are some tattooists called" responsible"？
A. They want to prevent their customers from suffering latch
B. They refuse to tattoo areas that cannot normally be covered up.
C. They are clean and careful in their work.
D. They carefully consider their customers' needs.
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My telephone number is 54362Have you ______？
A. written them down
B. written down it
C. written it down
当曝气池的水力停留时间较短如（）h左右，应以最大时流量作为曝气池的设计流量。
A. 1
B. 1.5
C. 2.5
D. 2
车行道下的污水管道最小覆土厚度一般不宜小于（）m。
A. 0.5
B. 0.7
C. 0.9
D. 1
下列说法中，正确的是()。
A. 2008年，我国灾毁耕地面积大于因农业结构调整减少的耕地面积
B. 2008年，我国工农业用水量比上年均有所增长
C. 2007年，我同万元国内生产总值的用水量约为251.7立方米
D. 2008年，我国新增查明的资源储量共计244.5亿吨
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