要使管式反应器反应体积最少,可逆吸热反应,应尽可能在( )温度下操作。
A. 较高
B. 较低
C. 最佳温度曲线
D. 不确定
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在相同条件下,同一反应,得到相同的转化率,在间歇釜中进行的反应时间与管式反应器中的空时一定相等。
A. 对
B. 错
供电系统发生短路故障时,其重要的特征是__1__和__2__。
We assure you that special care will be given to the packing of the goods lest they should be damaged__________.
A. by the way
B. en route
C. during voyage
D. in the way
E. for transport
He played the guitar so well that everyone was________.
A. affected
B. aroused
C. effected
D. impressed