碳能提高钢的塑性和韧性。（）

Kofi Annan says helping survivors of last week’ s earthquake and (1) . in the Indian Ocean is (2) . The United Nations secretary-general says countnes that have offered aid must (3) and provide it. The offers add up to around (4) dollars. Unitd Nations officials say (5) of that is needed during the next six months.
The concern about offers of international aid is (6) . For example, the earthquake in Bam, Iran, in (7) of 2003 killed more than (8) people. Countries and groups offered hundreds of millions of dollars (9) . The United Nations says it has (10) only about (11) dollars in aid received so far. Governments and organizations that offered help (12) that, however.
On (13) Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14) . The leaders discussed and (15) the idea of (16) owed by affected nations. But the leaders did not say they would do so. Some said that (17) to survivors would be more helpful.
Representatives of (18) countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19) for the Indian Ocean and the (20) .

如图所示为含有理想变压器的电路，图中的三个灯泡L₁，L₂，L₃都标有“5 V 5W”字样，L₄标有“5V 10 W”字样，若它们都正常发光，不考虑导线的能耗，则该电路的输入功率P_ab和输入电压U_ab应为

A.20 W 25 V

B.20 W 20 V

C.25 W 25 V

D.25 W 20 V

水果营养丰富，但是不同体质的人对水果的选择要特别慎重。下列关于水果的作用，说法不正确的是( )。

A．香蕉有“快乐果”的美誉，因为它能增加大脑中使人愉悦的5-羟色胺物质的含量。但是香蕉性凉，畏寒、体弱和胃虚的人不适宜食用
B．葡萄籽中含有丰富的增强免疫、延缓衰老的成分，因此葡萄最健康的吃法是不吐皮不吐籽
C．梨能帮助器官排毒、净化，还能软化血管。但梨性寒，畏寒肢冷者、腹胃虚弱者、产妇不宜多吃或者最好不吃
D．西瓜是夏季主要的消暑果品之一，其对口腔炎、酒精中毒也有一定疗效

游客游览景区须注意的衣着文明有哪些？

乘法运算是双操作数运算，但是，在指令中却只指定一个操作数，另一个操作数是隐含规定的，隐含操作数为（）

A.AL/AX

B.BL/BX

C.CL/CX

D.DL/DX