Support facilities for electric cars, such as charging stations, have been built or are      the process of being built in many cities across the country.

CSMA,although more efficient than ALOHA or slotted ALOHA,still has one glaring inefficiency.If the medium is busy,the station will wait for a random amount of time. When two frames collide,the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames,compared to propagation time,the amount of wasted capacity can be considerable.This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization..

A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.

The road （）built last year.

The president (or head) of the House of Lords in Britain is （）

When the renewal verification is completed more than three months before the expiry date of the existing Document of Compliance or Safety Management Certificate, the new Document of Compliance or the new Safety Management Certificate should be valid from the date of （） for a period not exceeding five years.

It has been decided that a collision due to any cause other than the negligence of the Shipowner or his servants is within the scope of（）.

The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.

Over the course of a year, a certain house appreciated in value by 10 percent while the house next door decreased in value by 10 percent as a result of foundation damage. At the end of the year, the reduced price of the second house was what percentage of the increased price of the first house?　　(1) The amount by which the first house increased in value was half as much as the amount by which the second house decreased in value.　　(2) At the end of the year, the second house was worth $70,000 more than the first house.

Building the Sydney Opera House lasted _____.

Two boards are being cut for a construction project. If the total length of the boards is 100 inches and the shorter board is 5 inches less than half the length of the longer board, what is the length of the shorter board?

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.