盘查中嫌疑人掏取枪械袭警时，民警应（）。
A.立即卧倒
B.迅速寻找掩护物
C.拉开距离
D.拔枪戒备
参考答案：B, C, D
-- Do you know _ her mobile phone?
一 No, I think it cost her around 4000 yuan.
A．when your sister paid for
B．how much your sister will pay for
C．how much your sister paid for
D．when did your sister buy
反式作用因子是指
A．DNA的某段序列B．RNA的某段序列C．组蛋白及非组蛋白D．具有转录调控作用的核酸分子E．具有转录调控作用的蛋白因子
