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【单选题】
下列反应属于酯化反应的是 [     ]
A.
2CH 3 CH 2 OH + 2Na → 2CH 3 CH 2 ONa + H 2 ↑
B.
C.
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参考答案:
举一反三
【简答题】改错。 (     ) 1. Whatever finishes first wins . A           B              C (     ) 2. When we arrived at the airport, our flight has already left. A     B                                C (     ) 3. E...
【单选题】关于法律和国家关系的表述中,正确的是( )
A.
国家需要法律
B.
法律先于国家而产生
C.
法律的产生与国家的产生没有必然联系
D.
法律不一定从属于国家
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【单选题】When we arrived at the airport, the plane _______. A). already took off B). took off already C). had already taken off D). has already taken off
A.
1
B.
2
C.
3
D.
4
【简答题】As a teacher . I often make it a rule that when we are on a field trip , there will be no talking as we enter a building . This rule 1 to entering any place , whether it is a cinema , a church , a the...
【单选题】V带传动设计中,限制小带轮的最小直径主要是为了 。
A.
使结构紧凑
B.
保证带和带轮接触面间有足够摩擦力
C.
限制弯曲应力
D.
限制小带轮上的包角
【单选题】V带传动设计中,限制小带轮的最小直径主要是为了
A.
使结构紧凑
B.
限制弯曲应力
C.
限制小带轮上的包角
D.
保证带和带轮接触面间有足够的摩擦力
【单选题】When we arrived at the airport, the plane___(depart).
A.
departed
B.
has departed
C.
is departing
D.
had departed
【单选题】When we reached the pier, the ferry had not arrived, so we ___.
A.
a. needn’t have hurried
B.
b. needed not worry
C.
c. didn’t need to hurry
D.
d. need not to have worried
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