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【多选题】
某现浇钢筋混凝土梁的跨度为8m，其跨中起拱高度可为（）mm。A.
2
B.
5
C.
15
D.
20
E.
30
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举一反三
【单选题】How many moles of cobalt(Co) atoms are there in 3.01 × 10 10 Co atoms?
A.
5.00 × 10 -17 mol Co
B.
5.00 × 10 -16 mol Co
C.
5.00 × 10 -15 mol Co
D.
5.00 × 10 -14 mol
【单选题】How many economic corridors does the" Belt and Road " Initiative have?
A.
6
B.
5
C.
7
D.
4
【单选题】How many reasons does the news item cite for Japan's slow economic growth?
A.
2.
B.
3.
C.
4.
D.
5.
【单选题】How many economic activities in the U.S. are created by consumers?
A.
two-thirds
B.
three-fourths
C.
half
D.
all
【单选题】About how many hectares of the farmland were lost to economic expansion and natural disasters in 1998?
A.
397, 000 hectares.
B.
261, 300 hectares.
C.
658, 300 hectares.
D.
Not clearly stated.
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