若函数y=4x+6-k的图象经过原点,那么k=______.
根据题意知,函数y=4x+6-k的图象经过点(0,0),
∴6-k=0,
解得,k=6;
故答案为:6.
In no country other than Britain, it has been said, ________ experience four seasons in the course of a single day.
A.people can
B.you can
C.can it
D.can one
中枢兴奋药具有的特点是
A.安全范围大
B.选择性较高
C.作用时间都短
D.需要反复用药才能长时间维持患者呼吸
E.很难避免惊厥的发生