由题意可得，1+cosx≠0
即cosx≠-1
所以，x≠π+2kπ
故答案为：{x|x≠π+2kπ，k∈Z}
250mL2mol/L盐酸中含有______个Cl-，配制该溶液需标准状况下的HCl气体______L，该HCl气体与______g的CO2具有相同的分子数．
-Tom has grown taller recently.
-________，and________.
A．So he has；so have you
B．So he has；so you have
C．So has he；so have you
D．So has he；so you have
