人孔内,供接续用光缆余留长度一般不少于()。
A.5m
B.6m
C.7m
D.8m
参考答案:C
_________ is Spring Festival? It's usually in February.[ ]
A. What
B. Where
C. When
8.设数列{an}是公差为-2的等差数列,如果a1+a4+a7+…+a97=50,那么a3+a6+a9+…+a99的值是( )
A.-82
B.-78
C.-148
D.-182