【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
D.
the whales are endangered
【单选题】-- _______exciting news! --Yes, the 12-year-old boy in Beiingwas saved after the successful heart transplant.