地网敷设时，接地网沟深度不宜小于（）m，人行过道处不应小于（）m。A、0.8，1.2

设（5a+3b）²=（5a﹣3b）²+A，则A=[ ]

A．30ab

B．15ab

C．60ab

D．12ab

关于潮气量的描述正确的是（ ）

A．成人潮气量约12～17ml／kg

B．潮气量上升常见于肺梗塞病人

C．潮气量上升可见于酸中毒的病人

D．潮气量是深呼吸状态下每呼或吸一次的气流量

白护卫（whitesquire）

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United 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)________.

营销调研是对营销活动中出现的某些特定的问题进行研究。