下列()不是金融期货。
A.黄金期货
B.外汇期货
C.利率期货
D.股指期货
参考答案:A
Meimei's home isn't _____ the school. So she goes to school _____ foot.[ ]
A. far from; by
B. far to; by
C. far from; on
D. far away; on
试述管道式喷灌系统的种类?