抛物线y=4x2的准线方程为______.
整理抛物线方程得x2=14y,∴p=18
∵抛物线方程开口向上,
∴准线方程是y=-116
故答案为:y=-116.
--Jim, put the things away and tidy(整理)your room.
-- Well, but I have ____ work to do, Dad.
A.many
B.a lot
C.lots of
D.too many
为便于塔柱内通风,宜在上、下游塔柱两侧壁上沿高度方向每隔()m设臵通风孔。
A、8m~12m
B、10m~15m
C、12m~16m