命题“圆的直径所对的圆周角是直角”是______命题.(填“真”或“假”)
在同圆或等圆中,同弧所对的圆周角是圆心角的一半,因此,直径所对的圆周角是直角.
∴是真命题.
We should give love to the children _ lost their parents in the earthquake.[ ]
A. who
B. whom
C. those
D. which
卫生间防水层应从地面延伸到墙面,高出地面()mm;浴室墙面的防水层不得低于()mm。
A.100mm;1800mm
B.100mm;1500mm
C.100mm;1600mm
D.100mm;2000mm