抗体筛选试验对血标本有何要求？

Hainan is in the south（南方）of China. The weather there is different from that of other areas of China. There is no winter in Hainan. It’s not cold all year round. Many people go there in winter, because it’s cold in the north（北方）of China. In summer, it’s very hot. It’s usually sunny, but it often rains. So people often take a pair of sunglasses and a raincoat at the same time. People can enjoy many kinds of fruits like bananas and coconuts there, too.

Hainan is a good place to go for holidays and have fun. People can go fishing, boating, swimming and so on. When we want to have a rest, we can walk on the beach (海滩) and enjoy the fresh air and white clouds. It’s so interesting.

Would you like to go to Hainan?

小题1:Hainan is in the _______ of China.

A．south

B．north

C．center

D．we don’t know小题2:What’s the weather like in Hainan?

A．It’s not cold all year round.

B．It’s very hot all year round.

C．It often snows in winter.

D．It’s in the south of China.小题3:Which of the following is NOT true?

A．There is no winter in Hainan.

B．In Hainan, people often take a pair of sunglasses and a rain coat in summer.

C．People can enjoy the fresh air and white clouds in Hainan.

D．Many people go to Hainan because it’s very hot.小题4:The main（主要的）idea of the passage is _______.

A．Where is Hainan

B．Hainan is a good place to go for holidays and have fun

C．The weather is fine in Hainan

D．There are many kinds of fruits in Hainan

镁燃料电池具有比能量高、使用安全方便、原材料来源丰富、成本低、燃料易于贮运等特点。研究的燃料电池可分为镁—空气燃料电池，镁—海水燃料电池，镁—过氧化氢燃料电池，镁—次氯酸盐燃料电池。如图为镁—次氯酸盐燃料电池的工作原理图，下列有关说法不正确的是(　　)。

A．放电过程中OH^－移向正极

B．电池的总反应式为Mg＋ClO^－＋H₂O=Mg(OH)₂↓＋Cl^－

C．镁电池中镁均为负极，发生氧化反应

D．镁—过氧化氢燃料电池，酸性电解质中正极反应为：H₂O₂＋2H^＋＋2e^－=2H₂O

外阴鳞状上皮细胞增生最主要的症状是（）

A.外阴疼痛

B.外阴瘙痒

C.白带增多

D.外阴皮疹

E.外阴结节

简答会计报表的编制要求。

使用喷雾仪时，最低水位线应（）电热元件

A.低于

B.水平于

C.接近

D.高于