清洗要素：时间：水冲300s碱溶液（）s；水冲300s酸溶液（）s水冲600s。（） A: 1600；1800 B: 1800；1400 C: 1400；1200 D: 1800；1200
清洗要素：时间：水冲300s碱溶液（）s；水冲300s酸溶液（）s水冲600s。（） A: 1600；1800 B: 1800；1400 C: 1400；1200 D: 1800；1200
According to “Chocolate”, the solid chocolate first appeared in the 1800s.
According to “Chocolate”, the solid chocolate first appeared in the 1800s.
The Town Hall _________ in the 1800’s was the most distinguished building at that time.
The Town Hall _________ in the 1800’s was the most distinguished building at that time.
What did the Irish use to carve the Jack-O’-Lanterns before the 1800’s?
What did the Irish use to carve the Jack-O’-Lanterns before the 1800’s?
1. The British government has been responsible for education since theearly 1800s.
1. The British government has been responsible for education since theearly 1800s.
中国大学MOOC: In the early 1800’s America was an increasingly industrious, mercantile, and profit-driven culture. The cultural emphasis on ______ was ever-present.
中国大学MOOC: In the early 1800’s America was an increasingly industrious, mercantile, and profit-driven culture. The cultural emphasis on ______ was ever-present.
2.5G（SDH）设备最多能接入（）个2Mbt/S信号。 A: 1000 B: 1008 C: 1800 D: 2000
2.5G（SDH）设备最多能接入（）个2Mbt/S信号。 A: 1000 B: 1008 C: 1800 D: 2000
LTC1815表示( )。 A: 宽1500,高1500 B: 高1800,宽1500 C: 高1800,宽1800 D: 宽1800,高1500
LTC1815表示( )。 A: 宽1500,高1500 B: 高1800,宽1500 C: 高1800,宽1800 D: 宽1800,高1500
在桥式（文氏桥）RC正弦波振荡电路中（）。 A: φA=-1800，φF=+1800 B: φA=+1800，φF=+1800 C: φA=00，φF=00
在桥式（文氏桥）RC正弦波振荡电路中（）。 A: φA=-1800，φF=+1800 B: φA=+1800，φF=+1800 C: φA=00，φF=00
The Town Hall in the 1800’s was the most distinguished building at that time. A: to be completed B: having been completed C: completed D: being completed
The Town Hall in the 1800’s was the most distinguished building at that time. A: to be completed B: having been completed C: completed D: being completed