以下哪些土质不宜用酒精燃烧法测定其含水量( )
A．含有机质土 B．细粒土 C．巨粒土 D．含石膏土
参考答案：A,C,D
设关于x的函数f（x）=4x-2x+1-b，若函数有零点，求实数b的取值范围．
. We all demanded the new type of machine ____________ put into use as soon as possible.
A．refer to
B．referred to be
C．refer to be
D．referring be
