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搜题
【单选题】
螺旋弹簧作为弹性元件,仅仅能承受( )
A.
水平载荷
B.
垂直 载荷
C.
任意载荷
D.
扭转
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举一反三
【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.
【判断题】只有企业才是消费税的纳税人。( )
A.
正确
B.
错误
【单选题】—Did you forget about my birthday? —________ I've booked a table at Michel's restaurant for this evening. [     ]
A.
What then?
B.
I'm afraid so.
C.
How could I?
D.
For sure.
【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.
【单选题】—Did you forget about my birthday? —____________ I’ve booked a table at Michael’s restaurant for this evening.
A.
So what?
B.
I’m afraid so.
C.
How could I?
D.
For sure.
【单选题】. —We have booked a room for today and tomorrow. — _________, sir.
A.
I’ll check
B.
My pleasure
C.
I’m sure
D.
It’s all right
【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
【简答题】光在真空中的传播速度为多少?若太阳和地球的平均距离为1.5×10 8 km,则太阳光照到地面要用多长时间?
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