皮皮学，免费搜题
登录
搜题
【简答题】
图所示系统置于以 的加速度上升的升降机内，A、B两物体质量相同均为m，A所在的桌面是水平的，绳子和定滑轮质量均不计，若忽略滑轮轴上和桌面上的摩擦，并不计空气阻力，则绳中张力为( )。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】钛及钛合金管道安装时，钛及钛合金管焊接应采用( )，不能采用氧—乙炔焊或二氧化碳气体保护焊，也不得采用普通手工电弧焊。
A.
手工电弧焊
B.
埋弧焊
C.
惰性气体保护焊
D.
真空焊
【简答题】Jack drives a school bus．His bus is different from other school buses because it doesn’t carry children．Jack’s bus takes dogs to school in the morning and brings them home at night．Jack takes the dogs...
【简答题】Accessing Internet drives, we __________.A. can get a higher access speed than accessing a internal drives B. should access a special Web service site C. should
consider information security D. can g...
【简答题】大多数致病菌生长的最适pH值为7.2～7.6，最适温度为 ℃。
【单选题】Which of the following is not true during the Queen Victoria’s rule?
A.
Ruling a quarter of the world's population.
B.
Soldiers were at war all over the world.
C.
The number of people living in Britain increased three times.
D.
Railways, factories and machines were built.
【单选题】Jack is a careful driver, but he drives _____ of my friends. [ ]
A.
more carefully
B.
the most carefully
C.
less carefully
D.
the least carefully
【单选题】Absolute monarchy in England reached its summit during the reign of Queen ______.
A.
Victoria
B.
Elizabeth 1st
C.
Mary
D.
Elizabeth 2nd
【单选题】The war began during the reign of Queen Elizabeth I. The statement is .
A.
false
B.
true
相关题目：