【简答题】(12分)利用所学化学反应原理,解决以下问题: (1)某溶液含两种相同物质的量的溶质,且其中只存在OH 一 、H + 、NH 4 + 、Cl 一 四种离子, 且c(NH 4 + )>c(Cl - )>c(OH - )>c(H + ),则这两种溶质是 。 (2)0.1 mol·L -1 的氨水与0.05 mol·L -1 的稀硫酸等体积混合,用离子方程式表示混合后溶液的酸碱性: 。 (3)已知:K ...
【单选题】Roger was a criminal who escaped from prison and ran away to _____.
【判断题】两种难溶化合物中,溶度积大的化合物溶解度一定大。
【单选题】Why do some European governments accept Bologna?
A.
It brings shorter and more work-related degrees.
B.
These governments all benefit from it in certain ways.
C.
It saves money for taxpayers.
D.
They want it as a replacement for reforms.
【单选题】What did governments do to discourage the employment of older workers in the 1970s?
A.
offer early retirement to all employees
B.
offer incentives to businesses to take on younger employees
C.
only employ young trainees
D.
set specific age limit for employment
【单选题】下列火灾隐患不属于当场改正并督促落实的是_____。
A.
常闭式防火门处于开启状态,防火卷帘下堆放物品影响使用的
【单选题】在发动机节气门开度和转速等均为变动的状态下,测定发动机功率的方法是( )。
【简答题】请计算(234+432)×(3÷3)=?
【单选题】What did governments do to discourage the employment of older workers in the 1970s?
A.
Offer early retirement to all employees.
B.
Set specific age limits for employment.
C.
Only employ younger trainees.
D.
Offer incentives to businesses to take on younger employees.