题干

已知一个棱长为2的正方体,被一个平面截后所得几何体的三视图如图所示,则该几何体的体积是(   )

A:8

B:203

C:173

D:143

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答案(点此获取答案解析)

C

同类题2

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礼论

王安石

    呜呼,荀卿之不知礼也!其言曰“圣人化性而起伪”,吾是知其不知礼也。知礼者,贵乎知礼之意,而荀卿盛称其法度节奏之美,至于言化,则以为伪也。亦乌知礼之意哉?夫礼始于天而成于人,知天而不知人则野,知人而不知天则伪。圣人恶其野疾其伪,是礼兴焉。

    今荀卿以谓圣人之化性为起伪,则是不知天之过也,然彼亦有见而云尔。凡为礼者,必诎其放傲之心,其嗜欲之性。莫不欲逸为尊者劳,莫不欲得而为长者让,擎跽曲拳,以见其恭。

    夫民于此,岂皆有乐之之心哉?患上之恶己,而随之以刑也。故荀卿以为特劫法度之威,而为之于外尔,此亦不思之过也。夫斫木而为之器,服马而为之驾,此非生而能者也。故必削之以斧斤,直之以绳墨,圆之以规而方之以矩,束联漆之,而后器适于用焉。前之以衔勒之制,后之以鞭策之威,驰骤舒疾,无得自放,而一听于人,而后马适于驾焉。由是观之,莫不劫之外而服之以力者也。然圣人舍木而不为器,舍马而不为驾者,固亦因其天资之材也。今人生而有严父爱母之心,圣人因其性之欲而为之制焉,故其制虽有以人,而乃以顺其性之欲也。

    圣人苟不为之礼,则天下盖将有慢其父而疾其母者矣。此亦可谓失其性也。得性者以为伪,则失其性者乃可以为真乎?此荀卿之所以为不思也。

    夫狙猿之形,非不若人也,欲绳之以尊卑而节之以揖让,则彼有趋深山大麓而走耳,虽畏之以威而驯之以化,其可服邪?以谓天性无是而可以化之使伪耶,则狙猿亦可使为礼矣。故曰礼始于天而成于人,则无是,而人欲为之者,举天下之物,吾盖未之见也。

(选自《王安石文集》)

同类题4

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Tail Spin

    Two dolphins race around in a big pool in the Ocean Park. The smaller dolphin Grace, shown off a few of her tricks, turning around and waving hello to the crowd. The most amazing thing about her, however, is that she's even swimming at all. She doesn't have a tail.

    Grace lost her tail as a baby when she got caught up in a fish trap. When the dolphin arrived at the Ocean Park in December 2005, she was fighting for her life. “Is she going to make it?” Her trainer, Abbey Stone, feared the worst. Grace did make it --- but her tail didn't. She ended up losing her flukes and the lower part of her peduncle.

    Over the past six years, she has learned to swim without her tail. Dolphins swim by moving their flukes and peduncle up and down. Grace taught herself to move another way---like a fish! She pushed herself forward through the water by moving her peduncles from side to side.

    The movement put harmful pressure on Grace's backbone. So a company offered to create a man-made tail for her. The tail had to be strong enough to stay on Grace as she swam but soft enough that it wouldn't hurt her.

    The first time Grace wore the artificial tail. She soon shook it off and let it sink in the bottom of the pool. Now, she is still learning to use the tail. Some days she wears it for an hour at a time, others not at all. “The tail isn't

necessary for her to feel comfortable,” says Stone, “but it helps to keep that range of motion(动作) and build muscles(肌肉).”

    Now, the dolphin is about to get an even happier ending. This month, Grace will star in Dolphin Tale, a film that focus on her rescue and recovery. Her progress has inspired more than just a new movie. Many people travel from near and far to meet her. Seeing Grace swim with her man-made tail gives people so much courage.

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