| National Geographic (61)
fill a number of roles, says Karen Kasmauski. "We are journalists;
researcher, thinkers," she says, "photography is our (62)
." As one of the Society’s six contributing photographers-in-residence, Karen seeks to focus (63) attention on global changes and how they (64) human health. One promising (65) is the anti-measles (66) in Kenya led by the American Red Cross, the Centers for Disease Control and Prevention, and UN (67) . "These photographers-in-residence have chosen subjects they’ve been (68) for years, subjects they’re (67) about," says program manager Charlene Valeri. Frans Lanting investigates (70) and the danger of (71) loss to animals in the wild. David Coubilet works to promote the survival of coral reef (72) in the Sou A. containing B. concealing C. comprising D. covering [单项选择]在下列微分方程中，以y=C1ex+C2cos2x+C3sin2x(C1，C2，C3为任意常数)为通解的是
(A) y’"+y"-4y’-4y=0． (B) y’"+y"+4y’+4y=0． (C) y’"-y"-4y’+4y=0． (D) y’"-y"+4y’-4y=0． [简答题]试风作业应按照<--NRC-->行走,作业时站在安全地点, 并随时 注意邻线机车、车辆动态及脚下有无障碍物。
[单选题]违反《建设工程安全生产管理条例》的规定,县级以上人民政府建设行政主管部门或者其他有关行政管理部门的工作人员,对不具备安全生产条件的施工单位颁发资质证书的,给予降级或者撤职的行政处分;构成犯罪的,依照刑法有关规定追究( )。
A.民事责任 B.行政责任 C.刑事责任 D.赔偿责任 [单选题]以下不属于B2C跨境电商平台的是 ( )。
A.阿里速卖通 B. eBay C. Wish D. 环球资源 [名词解释]统一式燃烧室
[判断题]管道过热也称为有害过热
A.正确 B.错误 我来回答: 提交
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