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【单选题】
下列关于水利水电施工用电安全的说法中错误的是（ ）。A.
露天使用的电气设备及元件，均用防水型或采取防水措施
B.
具备必要的技术理论知识和实际操作技能，并经培训后，即可成为电气工作人员
C.
熔断器的容量应满足被保护设备的要求，熔丝应有保护罩，且不得大于规定的截面
D.
110V以上的灯具只可作固定照明用，其悬挂高度一般不得低于2.5m
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【简答题】Runners in a relay race pass a stick in one direction. However, merchants passed silk, gold, fruit, and glass along the Silk Road in more than one direction. They earned their living by traveling the ...
【单选题】Which one is the key to making silk?
A.
Animals' carefulness.
B.
The water content in its silk glands.
C.
The proteins.
D.
The mulberry leaves
【单选题】根据以下材料，回答题 New Understanding of Natural Silk's Mysteries Natural silk， as we all know， has a strength that manmade materials have long struggled to match. In a discovery that sounds more like an ancie...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】She removed ________ hat she was wearing and tried on ________ black silk one. [ ]
A.
a; a
B.
the; the
C.
the; a
D.
a; the
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