一 Have you visited the Ji'nan Zoo?
— . There are many animals in it.
A:Yes, I have
B:No, I haven't
C:Yes, I haven't
D:Yes, I do
已知函数f(x)=lnx+2x,则不等式f(x2﹣3)<2的解集为____ .
They ___ the first animal into space yesterday. ( )
①金卡售价600元/张,每次凭卡不再收费.
②银卡售价150元/张,每次凭卡另收10元.
暑假普通票正常出售,两种优惠卡仅限暑假使用,不限次数.设游泳x次时,所需总费用为y元
每年冬至日阳光直射( )
某矿泉水标签上印有的主要矿物质成分及含是如下(单位mg/L):Ca~20、K~3、Zn~0.06、F~0.02等。这里Ca、K、Zn、F是指