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【判断题】
( )在不改变湿空气焓值的条件下,提高湿空气的温度,就必须对空气加湿。A.
正确
B.
错误
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举一反三
【单选题】During the lecture, the speaker occasionally ___________ his point by relating his own experience.
A.
illustrated
B.
hinted
C.
dealt
D.
purified
【简答题】金属镁的制取主要有两种途径，大约60%的镁是从海水中提取的，其余来自于含镁丰富的矿石，比如菱镁矿（主要成分为MgCO 3 ）．从不同途径获得镁的流程如图所示： 回答下列问题： （1）试剂a的化学式是______． （2）加入试剂b发生反应的离子方程式是______． （3）操作A是蒸发浓缩、冷却结晶、______． （4）在电炉中参加反应的n（Cl 2 ）：n（焦炭）=1：1，则该反应的化学方程式...
【简答题】制冷的方式主要有两种,即________和_________。
【单选题】______, the speaker interrupted his lecture.
A.
His voice was drowned by the noise
B.
His voice being drowned by the noise
C.
Drowned by the noise
D.
His voice drowned by the noise
【单选题】His deliberately ______ remarks of the Blacks' contribution to the music in his lecture resulted in the prompt protest among the audience.
A.
dubious
B.
concise
C.
provocative
D.
dual
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