【单选题】【消耗次数：1】
静定结构的几何组成特征是（ ）。
①
体系几何可变
②
体系几何瞬变
③
体系几何不变
④
体系几何不变且无多余约束
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相关题目
【单选题】
下列不能组成无多余约束的几何不变体系是（）。
①
三刚片以3个铰两两相联，3个铰不在一条直线上
②
二刚片以3个链杆相联，3个链杆不平行也不汇交
③
二刚片以1个铰和1个链杆相联
④
在一个刚片上加二元体
【单选题】
下列哪种情况不能组成无多余约束的几何不变体系（ ）。
①
三刚片以3个铰两两相联，3个铰不在一条直线上
②
二刚片以3个链杆相联，3个链杆不平行也不汇交
③
刚片上加二元体
④
二刚片以1个铰和1个链杆相联
随机题目
【单选题】
18. He ______ listen to pop music, but now he ______dancing.
①
is used to; used to
②
used to; is used to
③
used to; is used for
④
is used for; used to
【单选题】
4. One more week, ______ we will finish the task.
①
don’t they
②
didn’t they
③
did they
④
do they
【单选题】
5. I went to the doctor’s yesterday. I had to wait for half an hour before he _____ see me.
①
can
②
may
③
might
④
could
【单选题】
2. I was told yesterday that the company ______ me to Rome next week for a business conference.
①
should have sent
②
was going to send
③
should be sending
④
should send
【单选题】
17.Neither of them ____ the snake.
①
dares catches
②
dare to catch
③
dare catching
④
dare catch
【单选题】
12.You _____ return the book now. You can keep it till next week if you like.
①
cant
②
mustnt
③
neednt
④
may not
【单选题】
6. –Look, someone is coming. Guess who it _____ be?–I think it _____ be Tom.–I don’tthink it _____ be _____.
①
must; can; must; his
②
may; can; must; him
③
must; can; him
④
might; must; can; himself
【单选题】
1. If they ______ to do this work, he might do it some other way.
①
were
②
should
③
will
④
can
【单选题】
8. 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