What is stated in the e-mail？
A. New assembly workers will take a tour in the factory.
B. Assembly workers should work overtime on July 23.
C. A routine inspection will take place for 2 days.
D. Tiles in the assembly line should be replaced because of water damage.
How often does Mr. Whitman update his Web site？
A. Every month
B. Every three months
C. Every four months
D. Every six months
在下列回收废品中，如果没有回收，对环境造成危害最大的是()。
A. 废纸
B. 废玻璃
C. 废电池
D. 碎木
2009年真题改编)露天水池，水深5m处的相对压强约为()kPa。
A. 5
B. 49
C. 1 47
D. 205
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