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【多选题】
关于施工现场照明用电的说法，正确的有（）。A.
一般场所宜选用额定电压为220V的照明器
B.
灯具离地面高度低于2.5m等场所的照明，电源电压不得大于36V
C.
潮湿和易触及带电体场所的照明，电源电压不得大于36V
D.
锅炉或金属容器内的照明，电源电压不得大于24V
E.
室外220V照明灯具距地面不得低于2m
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【简答题】阅读理解。 If I were writing a history of my family, some of the darkest moments recorded would be those about Christmas trees. One would certainly think otherwise; selecting and putting up our trees have ...
【简答题】D-葡萄糖的α和β异头物的比旋分别为+112.20和+18.70。当α-D-吡喃葡萄糖晶体样品溶于水时,比旋将由+112.20平衡至+52.70。计算平衡混合液中α和β异头物的比率。假设开链形式和呋喃形式可以忽略不计。
【单选题】________ information! I hear you have finished writing a ________ report.
A.
What an excited; seven thousand word’s
B.
What excited; seven thousand words
C.
What an exciting; seven-thousand-word
D.
What exciting; seven-thousand-word
【简答题】L7-葡萄糖的α和β异头物的比旋[αD 20 ]分别为+112.2°和+18.70°。当α-D-吡喃葡糖晶体样品溶于水时，比旋将由+112.2°降至平衡值+52.70°。计算平衡混合液中α和β异头物的比率。假设开链形式和呋喃形式可忽略。[α异头物的比率为36.5%，β异头物为63.5%]
【单选题】March 16th, 2009 Dear Sir, In (141) with my agreement with your firm, I am writing to giving you formal notice of the termination of my service with you one month from now. The health of my wife makes...
A.
according
B.
accordance
C.
account
D.
accountant
【单选题】I don't like talking on ____ phone; I prefer writing ____ letters. [ ]
A.
a; the
B.
the; /
C.
the; the
D.
a; /
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