门窗框周边嵌缝在墙面抹灰前施工是预防砌块墙体墙面渗水的措施之一。( )
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Questions 23 and 24 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now, listen to the news. How many hours do the researchers advise people to spend doing weekly physical exercises
A. One hour.
B. Two hours.
C. One and half.
D. Two and half.
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. Who are really supposed to be underdogs, according to the passage you have heard
A. The losers.
B. The bosses.
C. The officials.
D. The millionaires.
水泥砂浆面层如遇管线等,局部面层厚度减薄处在20mm以下时,必须采取防止开裂措施。( )
A. 对
B. 错
聚氯乙烯宽幅卷材热风焊接法施工,焊接前应先将复合无纺布撕除,必要时还需用溶剂擦洗。( )
A. 对
B. 错