有一块走慢了10分钟的表,在10分钟前是12点整,现在正确的时间是几点钟()
A.12点20分
B.12点10分
C.20点12分
D.10点12分
参考答案:A
以下最适合实验室制取二氧化碳的反应是( )
A.CaCO3 高温 . CaO+CO2↑
B.NH4HCO3△..NH3↑+H2O+CO2↑
C.2CO+O2 点燃 . 2CO2
D.CaCO3+2HCL=CaCL2+H2O+C2O↑
Two explosions near the finish line of the Boston Marathon killed at least 3 people and injured more than 180 others, and currently FBI has figured out how it __________.
A.came up
B.came out
C.came across
D.came about