已知直线y=kx-7经过点(3,5),求不等式kx-7≥0的解集.
∵直线y=kx-7经过点(3,5),
∴5=3k-7,
解得:k=4,
∴4x-7≥0的解集为x≥74.
30. It is a good city for cycling because it is flat and ________is convenient for bikes.
A.however
B.what’s more
C.therefore
D.Besides
成熟T、B细胞定居的场所()
A.骨髓
B.胸腺
C.淋巴结
D.脾
E.黏膜相关淋巴结组织