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【单选题】
活塞环主要包括气环和油环,其中起密封作用的是?A.
气环
B.
油环
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皮皮学刷刷变学霸
举一反三
【单选题】Every human being has a【C1】______ arrangement of the skin of his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of fingerprints and discovered that【C2】...
A.
particular
B.
unique
C.
special
D.
strange
【单选题】In such a background, his white hair was particularly his dark skin．
A.
in relation to
B.
in need of
C.
in contrast to
D.
in favor of
【简答题】Every human being has a unique ① arrangement of the skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of finger-prints and discovered that no ...
【单选题】Passage Two Every human being has a unique arrangement of the skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of fingerprints and discovered...
A.
They vary from person to person.
B.
They are easily hidden and removed.
C.
Their uniqueness is beyond explanation.
D.
They remain unchanged throughout one's life.
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