胎儿宫内窒息的征象是()
A.胎心减慢至100次/分以下
B.羊水中有胎粪污染
C.子宫收缩乏力
D.胎动增加,胎心率≥160次/分
E.羊水流出
参考答案:A, B, D
下列细菌中,能使豆科植物生长良好(把空气中的氮气转化为氮素营养)的是( )
A.枯草杆菌
B.链球菌
C.根瘤菌
D.醋酸杆菌
-- Can you persuade him out of the foolish idea?
—_______ no point in doing so—he’ll never change his mind.
A.It is
B.It has
C.There is
D.There has