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【多选题】
对不饱和醛酮进行还原,可以得到不饱和醇的是A.
H2/Ni
B.
LiAlH4
C.
NaBH4
D.
H2S
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【单选题】The wooden house is still in excellent condition ______ it was built over 100 years ago.
A.
since
B.
because
C.
despite
D.
though
【简答题】施工准备工作的基本任务是了解施工的客观条件,根据工程的特点、进度要求,合理安排施工力量,从( )、( )、( )和施工组织等方面为工程施工创造一切必要的条件。
【单选题】Zhang Liang was a cook years ago, but he______ a model over the years.
A.
has become
B.
became
C.
becomes
D.
has been
【简答题】How old is “old”? The answer has changed over the years. Two Hundred years ago, you were old at 35. At the beginning of the 20th century, the average life span (平均寿命) was 45. In 1950, 70-year-olds wer...
【单选题】关于天体和天体系统的说法正确的是 [ ]
A.
天体是宇宙中各种物质的通称，其体积和质量都大于或等于月球，小于或等于太阳
B.
所有天体都相互吸引、相互绕转，处于不断运动之中
C.
总星系是目前人们所能观测到的宇宙部分
D.
银河系的中心部分是河外星系
【简答题】How old is “old”? The answer has changed over the years. Two hundred years ago，you were old at 35.At the beginning of the 20 th century，the average life span（平均寿命）was 45. In 1950，70-year-olds were re...
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