项目管理有四方面内容，下列( )工作对控制重复周期最有效。 A．估计成本 B．费

对苏轼《江城子·密州出猎》词理解不当的一项是( )。老夫聊发少年狂，左牵黄(犬)，右擎苍(苍鹰)。锦帽貂裘，千骑卷平冈。为报倾城随太守，亲射虎，看孙郎(孙权曾骑马射虎)。酒酣胸胆尚开张，鬓微霜，又何妨 持节云中，何日遣冯唐(人名，其渴望得到重用) 会挽雕弓如满月，西北望，射天狼(星名，代表贪残掠夺)。

A．本词上阕描写打猎的壮阔场面，下阕抒发由打猎激发起来的胸怀抱负，境界开阔，具有一种粗犷的豪迈风格。

B．首句的“狂”点出“老夫”酒后出猎无所顾忌的疯劲。

C．“千骑卷平冈”的“卷”字，突出地表现了武士骑马飞驰。

D．下阕最后三句，突出“老夫”关心边防。

在以下条件中，( )并非普通合同生效的要件。

A．合同的主体合格

B．应当采用书面形式

C．意思表示真实

D．不违反法律、行政法规的强制性规定

在研究轮胎侧偏力与侧偏角关系曲线时，一般将侧偏角等于零处的斜率称为轮胎的侧偏刚度。（）会使轮胎侧偏刚度增大。

A.增大轮胎尺寸

B.增大轮胎扁平率

C.增大轮胎的垂直载荷

D.降低轮胎气压

E.增大轮胎接地宽度

Caterpillars off all species produce an identical hormone called "juvenile hormone" that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.
Which of the following, if true, most ply supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above

A．Most species of caterpillar are subject to some natural predation.

B．Many agricultural pests do not go through a caterpillar stage.

C．Many agriculturally beneficial insects go through a caterpillar stage.

D．Since caterpillars of different species emerge at different times, several sprayings would be necessary.

E．(E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.

数据的逻辑结构有线性结构和 【1】 两大类。