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。