天文航海上所采用的对时信号是()。
A.UT0
B.UT1
C.UT2
D.UTC
参考答案:B
—Is that the laundry? I have some clothes ________.
—Leave them in your room,please,and we're going to fetch them soon.
[ ]
A. to wash
B. to be washed
C. washed
D. washing
初步可行性研究阶段投资估算的允许误差率为( )。
A.大于±30%
B.±30%以内
C.±20%以内
D.±10%以内