一个自行车前轮齿数是48个,后轮齿数是24个,前后轮齿数的比是( ):( ),也就是说脚蹬蹬一圈,车轮会转( )圈。
2;1;2
下列______做法不属于进度压缩。
A.某项目经理发现项目工期延后,让项目组成员加班加点,并提高加班工资,以期待能在规定时间内完成项目
B.某项目经理发现项目组成员由于对技术的掌握不熟练,造成进展缓慢,延误工期,于是指派了有经验的人员帮助完成
C.为了节省时间,在需求设计还没有完成时,项目经理就通知组内编程人员开始编写代码
D.项目经理启用应急时间来增加一些项目时间
Passengers must exit airplanes swiftly after accidents, since gases released following accidents are toxic to humans and often explode soon after being released. In order to prevent passenger deaths from gas inhalation, safety officials recommend that passengers be provided with smoke hoods that prevent inhalation of the gases. Which of the following, if true, constitutes the pest reason not to require implementation of the safety officials’ recommendation
A.Test evacuations showed that putting on the smoke hoods added considerably *o the overall time it took passengers to leave the cabin.
B.Some airlines are unwilling to buy the smoke hoods because they consider them to be prohibitively expensive.
C.Although the smoke hoods protect passengers from the toxic gases, they can do nothing to prevent the gases from igniting.
D.Some experienced flyers fail to pay attention to the safety instructions given on every commercial flight before takeoff.
E.(E) In many airplane accidents, passengers who were able to reach emergency exits were overcome by toxic gases before they could exit the airplane.