【单选题】The architecture is harmonious and no building is over six-storey high.
【简答题】热力站的主要设备为换热器,其他为水泵、()、分气缸、分水器、()等。
【简答题】机械曝气装置分竖轴机械曝气装置和卧轴式机械曝气装置,在竖轴曝气装置里常见有:泵型、K型、()和 平板型;在卧轴式机械曝气装置里主要分为()和转刷曝气器。
【单选题】小学老师在讲课的时候经常使用相关的实物教具,这是因为小学生的思维发展处于 ( ),思维活动借助于形象材料的支持可以进行得更为顺利 。
【单选题】部分回流法的压力溶气系统主要组成为水泵、空压机和()。
【单选题】One reason it is difficult to know why the whales are dying is that ______.
A.
the whales travel such a long distance
B.
there are more whales than there used to be
C.
the whale bodies are too old to study by the time they are found
【单选题】-- _______exciting news! --Yes, the 12-year-old boy in Beiingwas saved after the successful heart transplant.