digitalWrite(Buzzer,HIGH)语句的含义（ ）。

A . redundant infrastructure B . clustering of computer systems C . reduced MTBF D . continuous operation of computing system

A . 将低频部分从声音中滤除 B . 较为精确地调整音频的声音 C . 提供更多的音域控制 D . 创造特殊效果

A . stand by B . put up with C . withhold D . withstand

A .  redundant infrastructure B .  clustering of computer systems C .  reduced MTBF D .  continuous operation of computing system

A .  0 B .  1 C .  2 D .  3 E .  4

A . is a finer，more diffuse water spray than low-velocity fog B . requires that the water pressure be no greater than 60 psi C . produces an effective fog pattern no more than 6 feet beyond the nozzle D . extinguishes a fire by absorbing heat and reducing the supply of oxyge

A．max-avg B．max-prob C．start-avg D．queue

High-Tech Warfare(战争) Today, high-tech warfare is no longer an abstract concept, but a real issue. Technology__________________ (51) tactics, sociology, and the development of weaponry (武器).It also causes the changes in battles. Then what are the new characteristics of modern battles__________________ (52) by the application of high technologies？ High-tech warfare naturally includes high technology. In modern battles, a single kind of weapon can hardly be__________________ (53). Various weaponry, such as intelligence detection and information processing, should__________________ (54) well with each other. Aerial (航空的) weaponry becomes the main force in battles in the sky. Precision homing(精确自导) weaponry like cruise missiles and missiles__________________ (55) satellite homing systems becomes the main attack weapons. Battle control systems play a dominant role. Various weapons and logistics (后勤)systems are__________________ (56) into a comprehensive framework, centrally representing the modern high-tech weaponry. Depending on various__________________(57) equipment and means in electronic warfare, our army will not be passively beaten.__________________ (58) the battlefield, high-tech warfare has created a type of non-linear (非线性) chaos. Because of the use of long-range precision weaponry, the opposite parties in warfare can't "touch" or "see" each other, and distance is no longer the decisive factor affecting the__________________ (59) of battles. It is hard to clearly define the lines between the frontier and the rear, as well as attack and defense. The traditional three-dimensional air-sea battlefield will be__________________ (60) by the multi-dimensional battlefield composed of air, sea, magnetic, electrical and information battlefields. No large-scale movements can be conducted__________________ (61). Because modern weaponry systems are closely related to chains of demand and communication and electronic technology, the parties__________________ (62) have to pay attention to the usufruct (使用权) and control of electromagnetic frequency spectrum. So electronic warfare becomes__________________ (63) important and the necessary guarantee of victory. Whatever__________________ (64) warfare goes to and whatever cloak (伪装) it wears, it always violates peace and brings the world bloodshed (流血). Most people think of high technology as a__________________ (65) to enhance their lives, and they don't wish it to be used to destroy lives. 第 51 题 A．uses B．adopts C．determines D．selects

A．High-tech helps locate many fascinating archeological sites． B．Without high-tech, the archeologist’s work would come to a stop C．High-tech is has taken the place of shovels and picks． D．High-tech makes the archeologist’s work more fruitful．

A．熄灭时间太短，人眼无法识别 B．硬件出错 C．程序编译出错 D．程序只运行一遍

是 否