已知f（t）=δ（t）-δ（t-nT），n为任意整数，则g（t）的拉氏变换为（）。A

若粒子刚好能在如图所示的竖直面内做匀速圆周运动，则可以判断

A．粒子带负电

B．粒子带正电

C．只能是逆时针运动

D．只能是顺时针运动

For many years, Hawaii has been a magic name to people who like to travel. People on both sides of the Pacific Ocean, in Japan and in America, dream of seeing these beautiful islands in the middle of the ocean. Their dreams always include at least one scene of a sunset over the ocean. In the tropical(热带的) lands, the sun drops, like a ball of golden fire, into the sea, and it droops so quickly that you can almost see it move. The sun leaves behind a glow that lights the skies and shines in the quiet water.

People often have a quiet, peaceful time ---perfect for a leisurely(悠闲的) walk along the water. This scene is not too different from the dramatic(令人神往的) beauty that greeted the first strangers to these islands centuries ago. They were Polynesian people who came from Tahiti in canoes not much bigger than small boats.

They found the beautiful white sand beaches and the waving palm trees, but there were no giant hotels like the ones we see nowadays. The first people came to Hawaii nearly two thousand years ago, but skyscraper hotels were only built in the last 25 years. Now jet planes make it possible to fly to for a weekend from Tokyo. Wherever the people come from, they really want to see the original beauty of Hawaii. They want to see the lovely beaches and the mountain called Diamond Head which is almost hidden by the tall hotels.

小题1:Hawaii is a name _____.

A．given by people who like to travel

B．attracting a lot of travelers

C．with a magic story behind it

D．liked by both the Japanese and Americans小题2:On these beautiful islands, one thing that every traveler won't miss is_____.

A．to swim in the quiet water

B．to see the tropical plants

C．to see the sunset

D．a leisurely walk along the beach小题3:Which of the following does not belong to "the original beauty of Hawaii"?

A．White sand beaches.

B．Waving palm trees.

C．Tall hotels.

D．The Diamond Head Mountain.小题4:The last paragraph suggests_______

A．the scenery nowadays is not too different from the original beauty.

B．it's not quite easy to see the original beauty, because some of the scenery is almost hidden by tall hotels.

C．it is easy to see the original beauty, but only by taking jet airplanes.

D．it is not easy to see the original beauty because things have completely changed in the last 25 years.小题5:The best title of the passage is _______

A．Islands Scenery.

B．Hawaii A Magic Name.

C．Traveling In Hawaii.

D．The Dramatic Beauty.

为了贯彻一致性原则，会计期末各种成本差异的处理方法必须一致。（）

《中华民国临时约法》规定，参议院是______。

A．咨询机构 B．立法机构
C．行政机构
D．司法机构