下列定额分类中,( )是编制初步设计概算的依据。
A.预算定B.企业定额C.概算定额D.估算指标
参考答案:C
已知x=-1是关于x的方程7x3-3x2+kx+5=0的解,则k3+2k2-11k-85=______.
Look at the traffic lights. It's red. You must ____________.[ ]
A. wait
B. stop
C. go