下列选项中，（）属于无土栽培中的水培。
A.泥炭培
B.岩棉培
C.深液流培
D.喷雾培
参考答案：C
33. In the yard was an old man telling stories, with quite a few children__________him.
A．surrounding
B．surrounded
C．to surround
D．being surrounded
如图所示，当量程为0~3V时，电压表指针的读数为______V；当量程为0~15V时，电压表指针的读数为 ______V。
