机动车在高速公路匝道提速到每小时60公里以上时,可直接驶入行车道。
参考答案:错
The city of Yiwu is ______ unique attraction to tourists and businessmen at _____ home and abroad as there are various kinds of specialized markets in it.
A.an; /
B.the; the
C.a; /
D./; the
氨气中N元素呈最低价态(-3价),也具有很强的还原性,比如在加热条件下NH3也可还原氧化铜:2NH3+ ,在工业上也常利用反应3Cl2+2NH3 = N2+6HCl检查氯气管道是否有轻微的漏气。下列有关此说法错误的是 [ ]
A.若管道漏气遇氨就会产生白烟
B.该反应利用了氯气的强氧化性
C.该反应属于复分解反应
D.生成l mol N2有 6mol电子转移