区域锅炉房与工业和民用锅炉相比,具有()的特点。
A.投资小
B.供热效率高
C.建设周期短
D.可有效地节能
E.供热面积大
参考答案:B, D, E
已知命题q:只有一个实数x满足不等式x2+2ax+2a≤0;命题P:方程a2x2+ax-2=0在[-1,1]上有解,若命题“p或q”是假命题,求实数a的取值范围.
Simply learn to live in the present, _____ think so much about the future or the past.
A.rather than
B.other than
C.more than
D.less than