玻璃器皿不可盛放浓碱液，但可以盛酸性溶液。
参考答案：对
水力警铃与报警阀连接的管道，其管径应为（）mm。
A、10
B、20
C、30
D、40
The poor boy was ________ by his grandparents.[ ]
A. brought forward
B. brought in
C. brought up
D. brought about
