副反应

现代管理学派中，权变理论学派的代表人物是()。

A．孔茨　

B．西蒙　

C．卢丹斯　

D．明茨伯格

一般来说，免税债券的到期收益率比类似的应纳税债券的到期收益率（）。

A．高

B．低

C．一样

D．都不是

It’s hard to track the blue whale, which has almost been killed off by commercial whaling. Attaching radio devices to it is difficult and visual sightings are too unreliable to give real insight into its behavior.

So biologists were delighted early this year when, with the help of the US Navy, they are able to track a particular blue whale for 43 days recording its sounds. This was possible because of the Navy’s former top secret system of underwater listening devices across the oceans.

Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.

Earth scientists announced at a news conference recently that they had used the system for closely observing a deep-sea volcanic eruption for the first time and that they planned similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in the ocean and global temperatures. Different layers of ocean water can act as channels for sounds focusing them in the same way a stethoscope(听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.

小题1:The underwater listening system was originally designed _________________.

A．to trace and locate enemy ships

B．to observe deep sea volcanic eruptions

C．to study the movement of ocean currents

D．to replace the global radio communications network小题2:The deep-sea listening system makes use of __________________.

A．the ability of sound to travel at high speed

B．the top-level technology of focusing sounds under water

C．the unique characteristic of layers of ocean water in carrying sound

D．low-frequency sounds traveling across different layers of water小题3:What can we infer from the passage?

A．New radio devices are developed for tracking the blue whales.

B．Blue whales are no longer endangered with the new system.

C．Opinions differ on the use of military technology.

D．Military technology has great potential in civilian use.小题4:What is the passage chiefly about?

A．An effort to protect an endangered marine species.

B．The civilian use of a military detection system.

C．The exposure of a US Navy top-secret weapon.

D．A new way to look into the behavior of blue whales.

精馏塔进料量增大时，采出量应（）。

A.减少

B.增大

C.不变

D.随意

康熙白釉