已知圆锥的底面直径为4cm,其母线长为3cm,则它的侧面积为______cm2.
底面直径为4cm,则底面周长=4π,侧面积=12×4π×3=6πcm2.
When a friend gave Tom a ticket he ________ to the game.
A.couldn’t help but go
B.couldn’t help but going
C.can’t help but to go
D.can’t help but going
在五行相克关系中正确的是()
A.水克金
B.火克土
C.金克木
D.土克火
E.木克水