稀酸转耙在启动后，转耙应（）。A、降到最低点 B、随意 C、根据扭矩情况逐渐降低

Taiwan police cannot decide whether to treat it as an extremely clever act of stealing or an even cleverer cheat. Either way, it could be the perfect crime, because the criminals are birds homing pigeons!

The crime begins with a telephone message to the owner of a stolen car: if you want the car back, pay up. Then, the ear owner is directed to a park, told where to find a bird cage and how to attach money to the neck of the pigeon inside. Carrying the money in a tiny bag, the pigeon flies off.

There have been at least four such pigeon pick ups in Changwa. What at first seemed like the work of a clever stay at home car thief, however, may in fact be the work of an even lazier and more inventive criminal mind—one that avoids not only collecting money but going out to steal the car in the first place. Police officer Chen says that the criminal probably has pulled a double trick: he gets money for things he cannot possibly return. Instead of stealing cars, he lets someone else do it and then waits for the car owner to place an ad in the newspaper asking for help.

The theory is supported by the fact that, so far, none of the stolen cars have been returned. Also, the amount of money demanded—under 3,000 Taiwanese dollars—seems too little for a car worth many times more.

Demands for pigeon delivered money stopped as soon as the press reported the story. And even if they start again, Chen holds little hope of catching the criminal. "We have more important things to do", he said.

The underlined word "they" in the last paragraph refers to ().

A．criminals

B．pigeons

C．the stolen cars

D．demands for money

下列关于营业现金流量的计算公式正确的有()。

A.营业现金流量=营业收入-付现成本-所得税

B.营业现金流量=税后净利润+折旧

C.营业现金流量=税后收入-税后付现成本+折旧抵税

D.营业现金流量=收入×(1-所得税税率)-付现成本×(1-所得税税率)+折旧

第二心音产生的主要构成成分是（）

A.半月瓣关闭

B.半月瓣开放

C.心肌收缩力

D.房室瓣开放

E.房室瓣关闭

国有资产产权界定遵循( )原则。

A．谁投资，谁拥有所有权

B．谁投资，谁拥有经营权

C．谁投资，谁拥有管理权

D．谁投资，谁拥有产权

伴随神九飞船安全返回的还有玉米、辣椒、茄子、番茄、刀豆等种子。航天育种，是指利用空间环境中宇宙辐射、微重力和弱地磁场等多种因素，诱使农业生物遗传变异，再通过严格的地面选育，获得优良农作物品种的过程。这从一个侧面表明（）

①对真理的追求是永无止境的循环过程

②真理是理论与实践的具体的历史的统一

③客观事物的复杂性决定了认识的反复性

④认识只有不断超越历史条件才能成为真理

A.①②

B.①④

C.②③

D.③④