分裂发生在原始胚盘形成后即受精后第13天以上
A.硫酸镁静脉滴注B.盐酸哌替啶肌注C.肼屈嗪静脉滴注D.甘露醇静脉滴注E.地西泮静脉滴注
参考答案:D
After the accident a policeman was appointed to _________ the cause of the big fire.[ ]
A. look for
B. look after
C. look into
D. look upon
If the profits in one year are not sufficient to pay the dividend, the ______ will be paid from the profits of later year.
A.arrear
B.debt
C.difference
D.margin