在墙体承重建筑中.板式楼板多用于跨度()的房间或走廊。
A.≤0.5m
B.≤2.5m
C.≤3m
D.≤5m
参考答案:B
配制一定物质的量浓度的NaOH溶液时,造成所配溶液浓度偏高的原因是( )
A.所用NaOH已吸潮
B.向容量瓶加水时液面低于刻度线即摇匀
C.有少量NaOH溶液残留在烧杯内
D.向容量瓶加水时眼睛一直仰视液面
_________ a sports meeting in our school this Friday afternoon.
A.There is going to be
B.There will have
C.There are going to be
D.There is going to have