已知△ABC是边长为1的等边三角形,点D、E分别是边AB、BC的中点,连接DE并延长到点F,使得DE=2EF,则的值为()。
A.
B.
C.
D.
参考答案:B
Internet实现了分布在世界各地的各类网络的互联,其最基础和核心的协议是______。
A.HTTP B.HTML C.TCP/IP D.FTP
.
Premier Wen said, “I once again emphasize that it is absolutely unacceptable to sacrifice people’s life and health ________ the economic development in any case.”
A.in the hope of
B.in return for
C.in the face of
D.in exchange for