腐败性脓胸是由哪种细菌引起的感染（）
A.厌氧菌
B.大肠杆菌
C.真菌
D.绿脓杆菌
E.链球菌
参考答案：A
解析：腐败性脓胸是由于厌氧菌引起。
用一个平面截长方体、五棱柱、圆柱和圆锥，不能截出三角形的是（ ）
In 2000, Able Builders, Inc. was awarded a contract to build a bridge for the City of Metropolis. A reliable estimate of the total cost of the contract was $ 60000000. The contract price was $ 80000000. All invoices were paid in cash in the year the invoice was submitted. A schedule of revenues received and costs incurred during the contract was as follows (in $ millions):
A．
B．2001
C．2002
D．2003
E．2004
F．Amount Invoiced
G．l0
H．30
I．30
J．10
K．Costs Incurred
L．12
M．22
N．21
O．5
