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【多选题】
列关于栏杆高度说法错误的有
A.
凸窗窗台高400mm需在窗台上加500mm的防护栏杆
B.
中高层建筑物临空栏杆净高不小于1.05m
C.
若栏杆下部有宽度0.22m、高度0.45m的可踏部位,栏杆高度突可踏部位顶点开始计算
D.
防少年儿童攀爬的栏杆净距不大于0.11m
E.
多层民用建筑楼梯靠楼梯井一侧水平扶手长度超过0.5m时,其高度不应小于1.05m
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举一反三
【单选题】She worked hard at her task before she felt sure that the results would ______ her long effort.
A.
justify
B.
testify
C.
rectify
D.
verify
【简答题】一个由4个构件组成的机构一共有______个瞬心,其中有______个绝对瞬心,有______个相对瞬心。
【单选题】一质量为m的质点,自半径为R的光滑半球形碗口由静止下滑,质点在碗内某处的速率为v,则质点对该处的压力数值为
A.
mv 2 /R
B.
3mv 2 /2R
C.
2mv 2 /R
D.
5mv 2 /2R
【单选题】一个由5个构件组成的机构一共有______个瞬心,其中有______个绝对瞬心,有______个相对瞬心。
A.
6 , 3 , 3
B.
8 , 4 , 4
C.
10 , 5 , 5
D.
10 , 4 , 6
【简答题】The girl worked so hard that (ual) ______ she made herself seriously ill.
【简答题】A.She worked hard and was successful. B.She lived a poor life in the past. C.She needs much sleep. D.Both A and B
【判断题】通常皮肤表面的pH值为4.5~6.5,呈弱酸性。()
A.
正确
B.
错误
【单选题】Susan worked very hard and she picked _____ oranges of all the children on the farm.
A.
most
B.
the most
C.
more
D.
more and more
【单选题】一个由 4 个构件组成的 机构一共有 ______ 个瞬心,其中有 ______ 个绝对瞬心,有 ______ 个相对瞬心。
A.
6 , 3 , 3
B.
4 , 2 , 2
C.
6 , 4 , 2
D.
4 , 1 , 3
【简答题】Connie was told that if she worked too hard, her health would ________. A) deteriorate B) descend C) degrade D) decay
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