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【单选题】
《大林寺桃花》的作者是( )。A.
B.
C.
D.
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【简答题】A biome is a major biotic community characterized by the dominant forms of plant life and the prevailing climate. It is a major ecological community, extending over a large area and usually characteri...
【单选题】The Great Plains are a broad expanse of grassland.
A.
extension
B.
very large area
C.
big gap
D.
spending of money
【多选题】The major technical features of the pit fields method are _________.
A.
Instead of plowing every inch of land, only the pits are dug deeply and then plowed.
B.
It’s mainly applied in large scale on big plains.
C.
The seeds are sowed with equal distance in the field and there are different rules for distance among seeds for different crops
D.
Dividing fields into smaller pits helps centralize the management of the field.
【简答题】相对弯曲半径 R/t 越小,则弯曲时回弹()。A. 越小 B. 越大 C. 没有影响 D. 可以忽略
【单选题】All of the following statements are true of the northern Great Plains EXCEPT
A.
Summer temperatures are very hot, while winter temperatures are very cold
B.
An unbroken prairie now extends from the western mountains to the eastern forest
C.
The original vegetation consisted of shortgrass, mixed grass, and tallgrass
D.
A large number of small wetlands are found throughout the region
【多选题】减小弯曲件回弹的措施（）。
A.
改进弯曲件的设计，避免使用过大的弯曲相对半径r/t
B.
采用校正弯曲代替自由弯曲
C.
对冷作硬化的材料须先退火，使其屈服点降低，必要时采用加热弯曲
D.
合理设计弯曲模
【单选题】Plains are large areas of ______.
A.
high mountains
B.
flat land
C.
thick woods
D.
water
【简答题】At the beginning of the 20th century there were more than a million lions worldwide. Today there are less than 30,000 in the wild. The remaining lions are increasingly threatened by habitat loss, hunt...
【简答题】_______ are used in plains where rainfall is less and climate is moderate. ______ are preferred wherever rainfall is more. _____ are used to cover large column free areas required for auditoriums, fac...
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