【单选题】以空气为载冷剂时,取蒸发温度比载冷剂出口温度低()℃。
【单选题】听力原文: Strikes are very common in Britain. They are extremely harmful to its industries. In fact, there are other countries in Western Europe that lose more working days through strikes every year than...
A.
They often take place in the major industries.
B.
British trade unions are more powerful.
C.
There are more trade union members in Britain.
D.
Britain has less working days through strikes every year.
【单选题】听力原文: Strikes are very common in Britain. They are extremely harmful to its industries. In fact there are other countries in Western Europe that lose more working days through strikes every year than ...
A.
They often take place in the major industries.
B.
British trade unions are more powerful.
C.
There are more trade union members in Britain.
D.
Britain loses more working days through strikes every year.
【判断题】含羞草这种收起叶柄,并且把头低下的现象并不是因为害羞,而是它受到刺激和震动后的一种反应。这种反应在生物学上称为感性运动。
【判断题】当砂浆原材料种类及比例一定时,其流动性主要取决于单位用水量。
【简答题】如图所示,与图中情景相关的说法中正确的是 A.动物之间可以通过声音传递信息 B.控制公路噪声的唯一途径是减少鸣笛 C.海豚只能接收超声波 D.交响乐队中所有乐器音色完全相同
【判断题】含羞草这种收起叶柄,并且把头低下的现象并不是因为害羞,而是它受到刺激和震动后的一种反应。这种反应在生物学上称为感性运动。
【单选题】新建、扩建、改建建设项目和技术改造、技术引进项目可能产生职业病危害的,建设单位在( )应当向有关行政部门提交职业病危害预评价报告。