单项选择题

在SAS程序中,用于协方差分析的程序步为()
A、proc glm
B、proc glmmix
C、PROC GLMMIX
D、PROC GLMID

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After two days of preparation, the goods are finally ready for __________.

答案： (1)
transport

单项选择题

The melting temperature (Tm) is defined as
A. The temperature at which DNA begins to unwind the double strands

B. the temperature when A260 reaches its maximum

C. the temperature when A260 reaches at 50% maximum change

D. the temperature when A280 reaches at 50% maximum

E. the temperature when DNA dissociate into two single-stranded DNA completely