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【多选题】
为了使钢轨具有最佳的抗弯性能,钢轨的断面形状采用“工”字形 ,由( )、( )和( )组成A.
轨顶
B.
轨头
C.
轨腰
D.
轨底
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反馈参考答案：
举一反三
【单选题】★★★ MMXVII-VI-I
A.
In cash
B.
By credit card
C.
With a traveler's check
D.
With his smart phone
【单选题】★★★ MMXVII-VI-I
A.
They avoid looking at them.
B.
They run away immediately.
C.
They show anger on their faces.
D.
They make threatening sounds.
【单选题】★★★ MMXVII-VI-I
A.
Give him a receipt
B.
Confirm his flight
C.
Look after his luggage
D.
Find a porter for him
【单选题】★★★ MMXVII-VI-I
A.
The man in the car was absent-minded
B.
The test driver made a wrong judgement
C.
The self-driving system was faulty
D.
The car was moving at a fast speed
【单选题】★★★ MMXVII-VI-I
A.
Tell him to play in her backyard
B.
Do something funny to amuse him
C.
Give him some cherry stones to play with
D.
Warn him of danger by making up a story
【单选题】★★★ MMXVII-VI-I
A.
They have done better than conventional cars
B.
They have caused several severe crashes
C.
They have posed a threat to other drivers
D.
They have generally done quite well
【单选题】★★★ MMXVII-VI-I
A.
It turns to its owner for help.
B.
It turns away to avoid conflict.
C.
It looks away and gets angry, too.
D.
It focuses its eyes on their mouths.
【单选题】★★★ MMXVII-VI-I
A.
They could break people's legs
B.
They could sometimes terrify adults
C.
They could fly against a strong wind
D.
They could knock people unconscious
【单选题】★★★ MMXVII-VI-I
A.
To stay safe.
B.
To save energy.
C.
To keep company.
D.
To protect the young
相关题目：
【单选题】★★★ MMXVII-VI-I
A.
In cash
B.
By credit card
C.
With a traveler's check
D.
With his smart phone
参考解析：
知识点：
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