Which of the following methods cannot inactivate HIV（）
A. 75% ethanol
B. Ultraviolet light
C. Iodine tincture
D. Sodium hypochlorite
E. Heating under 100℃ for 20 minutes
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Which of the following is incorrect about the characteristics of HIV（）
A. Retrovirus
B. Single-stranded DNA virus
C. Lentivirus
D. Include HIV-1 and HIV-2
E. Consists of envelope and core
74LS160的计数条件是（）
A. ET=0
B. EP=0
C. B．ET=0
D. EP=1
E. C．ET=1
F. EP=0
G. D．ET=1
H. EP=1
Which
of the following methods provides the most accurate results in cost estimation（）Which
of the following methods provides the most accurate results in cost estimation（）
A. Least-squares regression method
B. High-low method
C. Scatter-graph method
D. Account Analysis method
Which of the following belong to discretionary fixed costs？ There may be more than one correct answer（）
A. Insurance costs
B. Advertising
C. Depreciation on buildings and equipment
D. Research and development costs
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