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【单选题】
混凝土浇筑完毕后,混凝土强度达到( )前，不得在其上踩踏或安装模板及支架。A.
1N/mm2
B.
1.2N/mm2
C.
1.5N/mm2
D.
2N/mm2
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反馈参考答案：
举一反三
【单选题】At 4 percent interest for the use of $ 1 principal, how much would one pay?
A.
Six cents per year
B.
Twenty-five cents per year
C.
Four cents per year
D.
One cent per year
【简答题】若电磁吸盘电路中,17号线出现断路,则电路会出现________现象?
【单选题】What should one pay attention to during traveling England?
A.
If you need help, please turn to your teachers.
B.
The traffic moves on the left side of the road in this country.
C.
It is against the law for anyone to buy cigarettes or tobacco.
【简答题】How can one pay for his groceries?
【单选题】声音三要素是指( )。Ⅰ.声音的强弱;Ⅱ.音调的高低;Ⅲ，音色的好坏;Ⅳ，声源的方向;Ⅴ.混响时间的长短
A.
Ⅱ、Ⅲ、Ⅳ
B.
Ⅲ、Ⅳ、Ⅴ
C.
Ⅰ、Ⅱ、Ⅲ
D.
Ⅰ、Ⅳ、Ⅴ
【简答题】若电磁吸盘电路中,17号线出现断 路,则电路会出现________现象?
【简答题】One pay attention to the telephone etiquette when using telephones in public.
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