目前,我国水泥混凝土路面的面层较多采用()混凝土板。
A.普通(素)
B.碾压
C.连续配筋
D.钢筋
参考答案:A
读一读,判断正(√)误(×)。
Christmas is a happy holiday for children, because Santa Claus brings them gifts.
Small children believe (相信) that on Christmas Eve, Santa Claus will come down their chimney (烟囟) to
bring them gifts. Santa Claus is a legendary (传奇的) man. He is a fat, merry man. He has a long white beard
(胡须). He always wears a red suit and a red hat. Santa flies in the sky. He is pulled (拉) by eight deer(鹿).
When children go to bed on Christmas Eve, they put a sock on their bed for Santa. And Santa will put gifts
in it.
( ) 1. Children like Christmas.
( ) 2. Santa will come from their window.
( ) 3. Santa is pulled by eight bears.
( ) 4. Santa always wears red clothes.
( ) 5. On Christmas evening, Santa will put gifts in children's shoes.
下列哪项引起右室压力负荷过重()
A.脉动脉瓣关闭不全
B.三尖瓣关闭不全
C.静脉回流量增高
D.肺动脉高压
E.严重贫血