【单选题】【消耗次数：1】
关于双曲面表述不正确的是
①
双曲面分为单叶双曲面和双叶双曲面
②
关于坐标平面不对称
③
关于三条坐标轴对称
④
关于坐标原点对称
参考答案：
复制
纠错
相关题目
【单选题】
下列关于平面立体和曲面立体的相贯说法有误的一项是（ ）。
①
相贯线上的点即为两个形体表面的共有点
②
平面体与曲面体相交时，相贯线是由若干段平面曲线或平面曲线和直线所组成
③
绘制相贯线时，应先求每段曲线和直线，再求出曲线和直线的转折点
④
相贯线是两个相交立体表面的共有线
【简答题】
表面为曲面或曲面与平面所围成的立体称为。[填空(1)]
【单选题】
对牙周炎患者，我们如选择曲面体层片，下列说法哪种不正确
①
方便快捷，一张X线片上可观察整个上、下颌牙体和牙周情况
②
投照一张曲面体层X线片，患者接受的照射量要大于全口牙片
③
曲面体层显示细微结构比根尖片差
④
曲面体层摄影不能取代根尖片检查
随机题目
【单选题】
The old farmer, ____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.
①
supporting
②
having supported
③
being supported by
④
being supported
【单选题】
____ the front door ____, he had to enter the room through the back door.
①
Seen; painted
②
Seeing; painted
③
Being seen; being painted
④
Seeing; being painted
【单选题】
When he was a boy, he used to go there and watch ____.
①
to repair bicycles
②
bicycles to be repaired
③
bicycles being repaired
④
repairing bicycles
【单选题】
—Have you considered ____ your job as a teacher? —Yes. I like the job because a teacher is often considered a gardener.
①
?to change; to be
②
?to change; being
③
?changing; being
④
?changing; to be
【单选题】
Every one of you is looking forward ___ getting a good result. Better think carefully before writing down your answers. Wish you success!
①
?on
②
? in
③
?to
④
? of
【单选题】
— I hear ___ your grandpa ___ your grandma like watching Min Opera. — Right, just as many old people do in Fuzhou.
①
?both; and
②
?either; or
③
neither; nor
④
?not only; but also
【单选题】
Many teenagers have hobbies. But sometimes these hobbies can get ___ of schoolwork.
①
?on the way
②
?in the way
③
? by the way
④
?out of the way
【单选题】
I ___ go to bed until I ___ finished my work last night.
①
don’t; had
②
didn’t; have
③
didn’t; had
④
don’t; have
【单选题】
—Look, someone is coming. Guess who it ___ be?—I think it ___ be Tom.—I don’t think it ___ be ___.
①
?must; can; must; his
②
?may; can; must; him
③
?can; must; can; him
④
?might; must; can; himself