题干

下列离子方程式正确的是

A:碳酸氢钠溶液与少量石灰水反应:H++OH=H2O

B:氯化铵与氢氧化钠两种浓溶液混合加热:NH4+OHH2O+NH3↑ 

C:氢氧化镁与稀硫酸反应:H+OH=H2O

D:单质铜与稀硝酸反应:Cu+2H+2NO3 =Cu2+2NO↑+H2O

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B

同类题3

根据短文内容,选择正确答案。

A

    Each New Year is a time for change and a fresh start, so many people like to make New Year's Resolutions(决心). A New Year's Resolution is a promise you make to yourself to do something good or to stop doing something bad in the New Year. Here are some teenagers' New Year's Resolutions for 2016.

    My New Year's Resolution is to get healthy. I'll stop drinking soda, and I'll eat more fruit at least an apple every day. I'll also do more exercise, such as playing basketball for half an hour every day.

Brandon   


    I want to get better grades in the New Year. To realize it, I will pay more attention in class, do homework on time and study hard. When I have difficulties with lessons, I'll ask others for help instead of giving it up.                                                                                                                                                       

Laura


    I would like to be nice to the people around me, and not get angry for every little thing that others say or do to me. When I do feel angry, I'll take a break and find good ways to deal with it like exercising, reading, writing, or talking with a friend or parent.                                                                                                                                         

Jack   


    I'll try to be more helpful to others. I will start with small things, like helping my parents clean the house and wash dishes after meals. I'd also like to volunteer in some places in my community.                                                                                                                                                

Erica