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【判断题】
三个刚片之间用3个铰两两相连,所组成的体系是几何不变体系,且无多余约束。
A.
正确
B.
错误
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【单选题】First designated in 1970, Earth Day has become an annual international event concerns about environmental issues such as pollution.
A.
dedicated to raising
B.
dedicated raising
C.
dedicates to raise
D.
that dedicates to raising
【简答题】、我们总是先看见礼花绽放,后才听见爆炸声,这是因为 ,光在真空中的传播速度为 km/s。在一些科幻片中,也有类似现象。两艘飞船在太空中相互攻击,一艘飞船中弹后,一团火球后,随即传来一声大爆炸声。你认为这个场景中有没有违背物理知识的地方,若有,指出来: 。
【单选题】----- I have booked a room for today and tomorrow. ----- _______, sir.
A.
I’m sure
B.
My pleasure
C.
It’s all right
D.
I’ll check
【单选题】—I have booked a room ________two. —I’ll check, sir.
A.
for
B.
to
C.
of
D.
with
【单选题】—Waiter, I have booked a table for three in Room 101. — .
A.
We are going to restaurant
B.
Here are the menus.
C.
We have booked the seats
D.
Okay. This way, please.
【简答题】The first crocodiles(鳄鱼) lived on the Earth about 240 million years ago. How much do you know about these erous animals? Here are some amazing facts about them. ◆ The biggest crocodile is the salt...
【单选题】If you() the tickets, I will do the packing.
A.
will book
B.
book
C.
booked
【简答题】光在真空中的传播速度为______m/s,光在其他透明介质中的传播速度比在真空中的光速______;1光年等于______km.
【简答题】光在真空中的传播速度为 km/s。我们在欣赏远处的礼花时,总是先看见礼花绽放,后才听见爆炸声,这是因为 。
【单选题】已知光在真空中的传播速度是 3 × 10 8 m/s ,在尖晶石中的传播速度为 174419km/s ,尖晶石的折射率是
A.
0.58
B.
5.81
C.
1.72
D.
0.17
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