婴儿在生后多长时间内不易患缺乏叶酸所致的巨幼细胞贫血()
A.生后2个月内
B.生后3个月内
C.生后4个月内
D.生后5个月内
E.生后6个月内
参考答案:C
Hurriedly, they packed their belonging and set off ______the direction of the river.
A.for
B.to
C.at
D.in
木地板地面面层的施工要点中规定,毛地板铺设时,应与搁栅成()斜向钉牢,并使其髓心向上,板间的缝隙不大于3mm。
A.15°或20°
B.20°或30°
C.30°或40°
D.30°或45°