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【单选题】
水泥按照矿物组成分为( )A.
通用水泥
B.
硅酸盐水泥
C.
快硬水泥
D.
道路水泥
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举一反三
【单选题】The word hammock in this passage means ______.
A.
a suspension cage which can be swung to and fro in the air
B.
a seat hanging by two ropes from the branch of a tree
C.
a suspension bridge in the South American rain forests
D.
a net hung between two supports and used as a bed
【简答题】此画的名称( ),创作者是( )
【单选题】Why are suspension systems used on vehicle?
A.
It must also keep the tires in contact with the road regardless of road surface. A basic suspension system consists of springs, axles, shock absorbers, arms, rods and ball joints.
B.
The purpose of the complete suspension system is to isolate the vehicle body from road shocks and vibrations, which will otherwise be transferred to the passengers and load.
C.
Light commercial vehicles have heavier springs than passenger vehicles and can have coil springs at the front and leaf springs at the rear.
D.
Wheels must be strong enough to support the vehicle and withstand the forces caused by normal operation. At the same time, they must be as light as possible to help keep unsprung weight to a minimum.
【简答题】设 P :他生病了, Q :他出差了, R :我同意他不参加学习。 给出命题 “ 若不是他生病或出差了,我是不会同意他不参加学习。”的符号化形式。
【简答题】(红细胞)悬浮稳定性(suspension stability)
【简答题】设 P :他生病了, Q :他出差了. R :我同意他不参加学习 . 则命题 “如果他生病或出差了,我就同意他不参加学习”符号化的结果为( )。
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