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【多选题】
混凝土工程安全技术交底内容包括（）。A.
车道板单车行走宽度不小于1.2m，双车道宽度不小于2.4m
B.
当塔吊放下料斗时，操作人员应主动避让，防止料斗碰头和料头碰人坠落
C.
离地面2m以上浇筑过梁、雨棚和小阳台等，不准站在搭接头上操作
D.
使用振动机前应检查电源电压，输电应安装漏电开关，保护电源线路良好，电源不得有接头，机械运转要正常
E.
井架吊篮起吊时，井架安全门，头、手不准伸入井架内，待吊篮停稳后，可进入吊篮内工作
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【单选题】I believe that is a proper standard by which to judge people even though I still don't know ____ a good heart is.
A.
what
B.
which
C.
where
D.
how
【简答题】I believe that my country, Poland, is a perfect example for a place where food is particularly important. When we were little children, we began to understand how much a loaf of bread meant to our par...
【单选题】Now that I am older, I believe that is a proper standard ______ judge people.
A.
by which
B.
from which we
C.
by which to
D.
from which to
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