移动车
参考答案:
一种可以架摄影机以便拍摄移动镜头的台车。
It has been announced that passengers ____ remain in their seats until the dangerous subjects have been removed.
A.can
B.will
C.may
D.shall
土的三相比例指标中可直接测定的指标为:()
A.含水率、孔隙比、饱和度
B.密度、含水率、孔隙比
C.土粒相对密度、含水率、密度
D.密度、含水率、干密度