题干

燕麦胚芽鞘进行以下处理,均给予右侧光照射。(云母片透光、不透水)。图中能向右侧弯曲的是

A:①③⑤

B:②④⑤

C:②③⑤

D:①④⑤

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答案(点此获取答案解析)

A

同类题1

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    Admission & Opening Times

    Museum Opening Times

    The museum is open daily: 10 am—5 pm

    Collections Centre opens daily: 11 am—5 pm

    Last admission to the museum and Collections Centre is 4:30 pm.

    Closed: December 24, 2017—January 1, 2018 inclusive

    Museum Admission

Adult

£14

Child(5-16yrs)

£9

Under 5's

FREE

Concession(优惠)(60 yrs+, unemployed, student)

£12

Family ticket(2 adults, 3 children)

£39

Groups of 12 or more(pre-booking essential)

£9

    Your entry fee will be treated as a donation to our charity on which we may also be able to claim Gift Aid. In return you will receive FREE admission to the museum for a year with our Annual Pass (this excludes 5 Special Show Days per year).

    Tickets for today's date are only available to buy at the museum.

Museum Tours

    An optional tour of the museum is included in your entry fee. The tours are available between 11:15 am and 2 :15 pm every day. They do not have to be pre-booked but have time limits.

Collections Centre

    Access to the Collections Centre is included in your entry fee, so you will just need to show your museum admission ticket at the door to gain entry. The Collections Centre is open from 11 am to 5 pm with last entry at 4:30 pm.

Show Days

    On most show days the normal museum entry prices are applied. There are, however, five Special Show Days per year when the admission price varies, including entry both into the show and the museum. On these days, Gift Aid tickets and promotional vouchers(促销券) are not valid. Advance discounted Show Day tickets are available online or via our Ticket Hotline 019-266 45033.

For more information about the British Motor Museum, please click here.

同类题4

某化学课堂上同学们正在进行酸、碱、盐知识的探究,以下是教学片断,请你参与其中并认真填写空格.

【学生实验】将二氧化碳分别通入澄清石灰水和氢氧化钠溶液中,观察到前者变浑浊,后者无明显现象.
【学生板演】澄清石灰水变浑浊的原理____(用化学方程式表示)
【提出问题】二氧化碳通入氢氧化钠溶液中无明显现象,两者是否发生了化学反应?
【猜想假设】猜想①:两者发生了化学反应;猜想②:两者没有发生化学反应
【实验探究】
(1)小华设计了如图所示的A、B两个实验.
实验现象:A中软塑料瓶変瘪,B中____
(2)小红认为小华的实验是可行的,其共同原理是二氧化碳和氢氧化钠溶液反应,使容器内压强降低.小明同学却对此提出质疑,他认为小华的实验不严谨,其理由是____,要得到科学严谨的结论,仍利用该装置,补做的对比实验是____
(3)小宁设计的是通过检验生成物来验证猜想,请帮她填写实验报告.

 实验步骤 实验现象 实验结论
 向B实验后的溶液中加入
____
 
____
 验证了二氧化碳和氢氧化钠溶液反应

【实验结论】二氧化碳和氢氧化钠溶液发生了反应.
【反思拓展】通过此探究实验,我们发现,对于没有明显现象的化学反应,可以从两个不同的角度证明反应的发生,这两个角度是________