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【单选题】
以下对于和田玉的描述,哪一项是正确的?A.
与翡翠相似的是,和田玉的品质以质地细腻、透明度高为佳。
B.
新疆地区是“羊脂白玉”的唯一产地。俄罗斯、青海等其它产地的玉品质都较差，不具有投资收藏价值。
C.
行业里俗称的“阿富汗白玉”是指产自阿富汗地区的透闪石质玉石，其主要成分与新疆和田玉非常接近。
D.
和田玉中的“青花玉”是指同时有黑色和白色两种色调的品种，也可以说是墨玉和白玉的组合品种。
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举一反三
【单选题】I took the wrong at the last road junction, can you tell me how I get back on the motorway?
A.
turn
B.
turner
C.
turned
D.
turning
【单选题】I took the wrong at the last road junction. Can you tell me how I can get back on the motorway?
A.
cross
B.
turner
C.
turne d
D.
turn
【单选题】I took the wrong at the last road junction. Can you tell me how I can get back on the motorway?
A.
cross
B.
turned
C.
turn
D.
turner
【单选题】I took the wrong train. I didn't even know it_____ half an hour later. [ ]
A.
to
B.
until
C.
after
【单选题】I took the wrong train. I even didn't know it _____ half an hour later. [ ]
A.
to
B.
until
C.
by
D.
after
【单选题】下列关于索引的叙述中,错误的是()
A.
数据库表和自由表都可以建立唯一索引
B.
只有数据库表才能建立主索引引
C.
数据库表和自由表都可以建立普通索引
D.
只有数据库表才能建立候选索引
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