英語專四完形填空練習題
Flight simulator (飛行模擬器) refers to any electronic or mechanical system for training airplane and spacecraft pilots and crew member by simulating flight conditions. The purpose of simulation is not to completely substitute (1)_____ actual flight training but to thoroughly familiarize students with the vehicle (2)_____ before they (3)_____ extensive and possibly dangerous actual flight training. Simulations also is useful for review and for familiarizing pilots with new (4)_____ to existing craft.
Two early flight simulators appeared in England within a decade after the first flight of Orville and Wilbur Wright. They were designed to enable pilots to stimulate simple aircraft (5)_____ in three dimensions: nose up or down; left wing high and right low, or vice versa; and (6)_____ to left or right. It took until 1929, however, for a truly effective simulator, the Link Trainer, to appear, devised by Edwin A. Link, a self-educated aviator and inventor from Binghamton, New York. (7)_____, airplane instrumentation had been developed sufficiently to permit blind flying on instruments alone, but training pilots to do so involved (8)_____ risk. Link built a model of an airplane cockpit equipped (9)_____ instrument panel and controls that could realistically stimulate all the movements of an airplane. Pilots could use the device for instrument training, manipulating the controls (10)_____ instrument readings so as to maintain straight and level flight or (11)_____ climb or descent with no visual reference (12)_____ any horizon except for the artificial one on the instrument panel. The trainer was modified (13)_____ aircraft technology advanced. Commercial airlines began to use the Link Trainer for pilot training, and the US government began purchasing them in 1934, (14)_____ thousands more as World War II approached.
-
一年級英語下冊期末複習題
一、默寫下列單詞。haireyeearheadnosemouthhandarmfootlegbouncekickdrawcatchthrowputpotatopearcarrottomatoblueredblackpurplegreenyellowpinkshirtsockshoedresshatjacketskirt二、單項填空。()1.—Hegotthreeeyes.()egottwobig.()3.—canyousee?—Icans...
-
初中數學韋達定理習題及答案
法國數學家韋達最早發現代數方程的根與係數之間有這種關係,因此,人們把這個關係稱爲韋達定理。求實數k,使得方程kx^2+(k+1)x+(k-1)=0的根都是整數.解:若k=0,得x=1,即k=0符合要求.若k≠0,設二次方程的兩個整數根爲x1、x2,且X1≤X2,由韋達定理得∴x1x2-X1-x2=2,(x1-1)(x2-1...
-
小升初的英語模擬試題
小升初的英語模擬試題一、根據所給出的漢語完成英語句子。1.______________(四分之三)ofthewaterinthebottleisred.2.---Whendidyou_______(畢業)?----Lastyear.3.Iwanttotravel______the_____(周遊世界).yoneworks_______(幾個)hourseveryday.5.Ifhe_______(違...
-
《洪渥傳》的練習題
洪渥傳曾鞏洪渥,撫州臨川人,爲人和平。與人遊,初不甚歡,久而有味。家貧。以進士從鄉舉,有能賦名。初進於有司,連輒出;久之乃得官。官不自馳騁,又久不進,卒監黃州麻城之茶場以死。死不能歸葬,亦不能返其孥。裏中人聞渥死,無賢愚皆恨失之。予少與渥相識,而不深知其爲人。渥死...