留设()煤柱发生冲击地压危险性小。
A.大
B.小
C.宽
D.厚
参考答案:B
已知p:x2+mx+1=0有两个不等的负根,q:方程4x2+4(m-2)x+1=0(m∈R)无实根,求:使p为真命题且q也为真命题的m的取值范围.
----I didn’t realize how popular the restaurant was until I made a reservation the other day.
----I beg your pardon, but when ?
A.was you realized it
B.it was that you realized it
C.you realized it
D.was it that you realized it