小明将微风电风扇与小灯泡按如图所示的电路连接并进行实验，用手快速拨动风扇叶片，这

脑面血管瘤病的特征为（）

A.对侧偏瘫，偏身萎缩

B.一侧面部三叉神经分布区不规则血管斑痣

C.青光眼

D.癫痫发作和智能减退

E.高血压

铝、铁、铜是我们生活中常见的金属。

(1)铝制品具有很好的抗腐蚀性能，是因为铝在空气中其表面易形成致密的____________薄膜。

(2)图甲中发生反应后能生成______色固体，做该实验时，在集气瓶中预先加入少量水可以防止_____________________________。

(3)少伟同学从生活中发现，在潮湿的空气中铁比铜更容易锈蚀，由此他认为铁的金属活动性比铜_________（选填：“强”或“弱”)。他还想通过一个实验(如图乙)来进一步证明，并图乙中A为金属铁，你认为B是__________溶液。发生该反应的化学方程式是_______________________________。

With respect to major bond markets around the world, which of the following statements is most accurate

A. Investors in one country that acquires bonds issued by the government of another country are believed to be risk-free.
B. The factors that affect yield spreads in the U. S. are different than the factors that affect yield spreads in other countries and between countries.
C. An investor in one country that buys bonds denominated in the currency of another country has unknown cash flows in the investor's domestic currency.

在整块地滴水施肥结束后，应及时清洗施肥罐。