()是一种含氮18%,含磷46%的二元复合肥,它的特点是低氮、高磷,尤其在缺磷的土壤上效果特别好。
A、磷酸一铵
B、磷酸二铵
C、硝铵磷
D、硝酸磷肥
参考答案:B
原发性肠套叠有以下特点
A.随着年龄增长发病率降低
B.有明显病因
C.常见于2岁以下婴儿
D.套叠段无明显的器质性因素
E.男孩是女孩的2~3倍
His feature story opens and closes with descriptions of two new reports, each _____ one major point in contrast with the other.
A.makes
B.making
C.is to make
D.makes