常用硅烷偶联剂的主要成分为（）
A.10-MDPT
B.MDP
C.γ-MPTS
D.4-MET
参考答案：C
—What do you think about smoking?
—Well，just as someone puts ________，smoking kills.
A．this
B．it
C．that
D．one
有编号分别为1，2，3，4，5的5个红球和5个黑球，从中取出4个，则取出的编号互不相同的概率 .
