浓硫酸具有很强的腐蚀性,如果不慎将浓硫酸沾到皮肤或衣服上,应立即用大量的水冲洗,然后再涂上[ ]
A.3%~5%的NaHCO3溶液
B.硼酸溶液
C.稀盐酸
D.稀NaOH溶液
答案:A
The teachers were always trying to ______ the excited students at that time.
A.calm down
B.set down
C.let down
D.turn down
表现一个地区、一条战线新风貌的通讯称为( )
A.概貌通讯
B.工作通讯
C.事件通讯
D.景物通讯