A:一定会浮在水面上
B:一定会下沉
C:既可能浮在水面上也可能下沉到水底
用所给词的适当形式填空 The ruler____ (use) since I began my school life.Tony didn't find____ (learn) English easy.____ (compare) with Paris, London is larger.My mother encouraged me____ (enter) the competition of this year.His memory of the____ (please) trip will last long.
如图:AB为⊙O的直径,CD是⊙O的弦,AB、CD的延长线交于E点,已知AB=2DE,∠E=16°,则∠AOC的大小是____ °.
关于非洲地形的说法,正确的是 ( )