我国第一座商业化运营的天然气液化装置是()。
A、中原油田液化天然气装置
B、四川键为液化天然气装置
C、江苏天力液化天然气装置
D、海南海燃液化天然气装置
参考答案:A
sin10°sin30°sin50°sin70°=( )
—Do you often ______ your sister?
—Yes, she often writes to me. [ ]
A. hear
B. hear of
C. hear from
D. hear about