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【简答题】
在某旅游景区上山的一条小路上，有一些断断续续的台阶．如图是其中的甲、台阶路的示意图．请你用所的有关统计知识（平均数、中位数、方差和极差）回答下列问题： （1）两段台阶路有哪些相同点和不同点？ （2）哪段台阶路走起来更舒服，为什么？ （3）为方便游客行走，需要重新整修上山的小路．对于这两段台阶路，在台阶数不变的情况下，请你提出合理的整修建议． （图中的数字表示每一级台阶的高度（单位：cm）．并且数据15，16，16，14，14，15的方差S 甲 2 = 2 3 ，数据11，15，18，17，10，19的方差S 乙 2 = 35 3 ）．
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【简答题】窗的主要作用是 、 和
【单选题】{ 双曲柄机构机架长度为50 mm,两连架杆长度分别为100 mm和150 mm,则连杆长度L的最小值是_______________。 }
A.
50 mm
B.
100 mm
C.
150 mm
D.
200 mm
【简答题】窗的主要作用是采光。 判断对错
【单选题】— His sudden death surprised his wife. — It was so bad. His wife was surprised ____ his death. [ ]
A.
by
B.
with
C.
at
D.
on
【单选题】When Henry arrived home after a hard day at work, his wife was slept.
A.
his wife was sleeping
B.
his wife slept
C.
his wife has slept
D.
his wife has been sleeping
【单选题】[机械设计部分][中职和高职和教师][难] 双曲柄机构机架长度为50mm,两连架杆长度分别为100mm和150mm,则连杆长度L的取值范围是 ( )
A.
50mm≤L≤150mm
B.
100mm≤L≤150mm
C.
150mm≤L≤200mm
D.
100mm≤L≤200mm
【单选题】Mr. Pontellier felt extremely frustrated because ______.
A.
his wife overslept
B.
his wife greeted late
C.
his wife was indifferent to his talk
D.
his wife showed too much interest in his talk
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