胎儿能经 * * 顺利分娩,取决于()、()、()和()四大因素。
参考答案:产力;产道;胎儿;精神及心理因素
Lucy Lily may go to the concert with you. Because they are not allowed to go out on school
nights. [ ]
A. Either, or
B. Neither, nor
C. Both, and
D. Not only, but also
影响微生物生长发育的主要因子有()、氧气、水分、()和温度等。