试述管理学的两重性对学习和管理工作的意义。

某种商品每件进价12元，售价20元，每天可卖出48件．若售价降低，销售量可以增加，且售价降低x（0≤x≤8）元时，每天多卖出的件数与x²+x成正比．已知商品售价降低3元时，一天可多卖出36件．

（1）试将该商品一天的销售利润表示成x的函数；

（2）该商品售价为多少元时一天的销售利润最大？

脘腹痞闷，嘈杂，饥不欲食，恶心嗳气，口燥咽干，大便秘结，舌红少苔，脉细数。证属（）

A.痞满饮食内停证

B.痞满湿热阻胃证

C.痞满肝胃不和证

D.痞满痰湿中阻证

E.痞满胃阴不足证

证券承销方式有（）

A.全额包销

B.余额包销

C.自销

D.代销

在Excel的“单元格式”对话框中，不存在的选项卡是（）。

A.“货币”选项卡

B.“数字”选项卡

C.“对齐”选项卡

D.“字体”选项卡

Beyond question, Clinton was supposed to close up, stay out of sight, and avoid second- guessing his wife’s boss. After his ego blustered into oncoming traffic during Hillary’s heated primary race (1) Obama, the nation suffered from yet another turn of Clinton fatigue.

(2) this week Bill Clinton showed an instinct for robust, inclusive leadership that the (3) White House occupant could make good use of right for the time being. With President Obama struggling to (4) the political damage from the Gulf oil spill, Clinton not only can’t help himself—he’s worth being listened.

The conventional-wisdom (5) on President Obama’s early reaction to the spill was (6) he didn’t emote enough. He didn’t feel the (7) of all those people in the crisis whose livelihood would be destroyed, whose clean waters and wildlife would be (8) in black gunk.

Clinton considers this is an unfair (9) but offers a different—and more pointed— lesson to his young successor. "I think we ought to (10) in the same boat for a while... Let’s just (11) the problem, and then we can hold everybody responsible and emote or not emote, " Clinton conversed (12) CNN Anchor Wolf Blitzer.

Obama’s first (13) after the oil spill was to "feel the blame" rather than "feel the pain, " which are pretty sarcastic words as it were. No one intends to let British Petroleum (BP) management (14) the hook—for dangerously cutting corners, and for a (15) safety record. However, the President’s (16) focus on scolding BP consumed (17) White House energy while the oil gushed.

Great leaders don’t rush to criticise; Instead they instinctively (18) solutions. Rudy Giuliani, who didn’t stop to blame (19) intelligence for letting it happen, stood out from New York mayor with a girlfriend problem to 9/11 hero when he took control of a crisis and instilled confidence that a ravaged city could (20) beyond a terrorist attack.

17（）

A.abundant

B.valuable

C.surplus

D.restless