钢材脆性破坏同构件( )无关。 A．应力集中 B．低温影响 C．残余应力 D．弹

将一定量的SO₂和含0.7mol氧气的空气（忽略CO₂）放入一定体积的密闭容器中，550℃时，在催化剂作用下发生反应：2SO₂+O₂2SO₃（正反应放热）。反应达到平衡后，将容器中的混合气体通过过量

NaOH溶液，气体体积减小了21. 28L；再将剩余气体通过焦性没食子酸的碱性溶液吸收O₂，气体的体积又减少了5.6L(以上气体体积为标准状况下的体积)。（计算结果保留一位小数）请回答下列问题：

(1)判断该反应达到平衡状态的标志是____（填字母）。

a．SO₂和SO₃浓度相等

b．SO₂百分含量保持不变

c．容器中气体的压强不变

d．SO₃的生成速率与SO₂的消耗速率相等

e．容器中混合气体的密度保持不变

(2)求该反应达到平衡时SO₂的转化率（用百分数表示）___________。

(3)若将平衡混合气体的5%通入过量的BaCl₂溶液，生成沉淀多少克？_____________________

按要求连接下列实物图：

（1）连接基本电路：

（2）两盏电灯串联：

（3）两盏电灯并联

（4）两盏电灯并联，开关只控制L₁

（5）两盏电灯并联，开关控制L₁、L₂

患者男性，56岁。胃溃疡病l0年。现胃痛隐隐，喜温喜按，畏寒肢冷，泛吐清水，腹胀便溏，舌淡胖，边有齿痕，苔白，脉迟缓。治疗方剂是( )

A．柴胡疏肝散合五磨饮子
B．活络效灵丹合丹参饮
C．一贯煎合芍药甘草汤
D．化肝煎合左金丸
E．黄芪建中汤

生物膜法是一种（）处理技术。

A.厌氧生物

B.好氧生物

C.厌氧微生物

D.兼氧生物

Most people think that the older you get, the harder it is to learn a new language. That is, they believe that children learn more easily and efficiently than adults. Thus, at some point in our lives, maybe around age 12 or 13, we lose the ability to learn languages well. Is this idea a fact or myth(悬念)？

Is it true that children learn a foreign language more efficiently than adults? On the contrary, research studies suggest that the opposite may be true. One report, on 2,000 Danish children studying Swedish, concluded that the teenagers learned more, in less time, than the younger children. Another report, on Americans learning Russian, showed a direct improvement of ability over the age range tested; that is, the ability to learn increased as the age increased, from childhood to adulthood.

There are several possible explanations for these findings. For one thing, adults know more about the world and therefore are able to understand meanings more easily than children. Moreover, adults can use logical(逻辑的) thinking to help themselves see patterns in the language. Finally, adults have more self-discipline (self-control) than children.

All in all, it seems that the common idea that children are better language learners than adults may not be a fact, but a myth.

小题1:The main idea of the passage is that         .

A．teenagers are more difficult to teach

B．Danish teenagers can learn Swedish faster than younger children

C．adults are more logical than children

D．the ability to learn languages increases with age小题2: If most people’s idea of learning languages is true, people may lose ability to learn languages well         .

A．at an early age

B．when they reach their twenties

C．at an old age

D．after they become young men小题3:According to the passage, teenagers can learn a foreign language __________ than younger children.

A．harder

B．more efficiently

C．more slowly

D．more carefully小题4:The reason why adults understand meanings more easily than children is that         .

A．adults have more self-discipline

B．adults like to play more than children

C．adults have more knowledge than children

D．adults accept new things more easily than children小题5:The explanation for older student’s better achievement not mentioned in the above passage is that       .

A．adults know more about the world.

B．adults can use logical thinking

C．adults have more self-discipline.

D．adults can read better.