题干

下列有关实验的叙述正确的是(   )

A:“CO2的制取与性质”实验中,用燃着的木条放在集气瓶口检验CO2是否集满

B:“物质燃烧的条件”实验中,用玻璃杯罩住燃着的蜡烛以降低蜡烛的着火点

C:“配置一定溶质质量分数的NaCl溶液”实验中,把食盐放在托盘天平右盘称量

D:“溶液的酸碱性”实验中,测定溶液pH时将试纸预先用水湿润

上一题 下一题 0.0难度 选择题 更新时间:2020-02-06 01:24:02

答案(点此获取答案解析)

A

同类题5

阅读理解

School activities for kids and teens

     July is a month of fun-filled activities for kids and teens as long as you know where to find them. When you want some fun activities for July, consider these ideas happening in this month.

Secret of the Dragon

Time     Monday, July 1, 2013,

 10:30 am

Cost     Adult: $ 7.40

children (number 15 years): half

Bookings  Phone the booking office:

          3403 2578

Address   Brisbane Botanic Gardens

Note      Secret of the Dragon is a magical story about two children who are taken on a dragon ride to explore the universe.

The Search for Life:

Are We Alone?

Time    Thursday, July 4, 2013,

 2:00 pm

Cost     Adult: $ 14.50

         Children (under 15 years): $ 8.70

Bookings  Phone the booking office:

          3403 7689

Address   Brisbane Botanic Gardens

Note      Are we truly alone in space? Is there any life out there? These are the questions asked in this show.

Magic Class

Time     Friday, July 12, 2013,

         10:00 am

Cost      Free

Bookings  Please call 3403 8470 to book your place.

Address   Centenary Community hub, 171 Dande nong Rd

Note      Would you like to be a magician? Then join David, the magician, to learn about real magic with playing cards, coins, ring ropes and DIY projects and be able to become the life of the party.

Science with Me:

Making your own guitar

Time      Saturday, July 20,

           2013, 3:00 pm

Cost       Free

Bookings   Please phone 3403 1226 to book your place.

Address    10, Egginton Close

Note       Do you want to make a guitar with Katy and her mom? Science with Me is going to be with you. Please remember to bring a piece of wood, a hammer, some rubber bands and some nails with you.