检验批的抽样方案有（）。
A．免检
B．多样抽样方案
C．全数检验
D．随机抽样
E．分层抽样
参考答案：B, C, D
Some modem paintings are _____ my understanding; I simply can't understand what the painters really want to tell us.
A．within
B．behind
C．around
D．beyond
预制梁所用细骨料的含泥量不大于（）。
A、0.5%
B、2%
C、1%
