正常人的门静脉主干内径超声测值参考数为()
A.<1.2cm
B.上限值为1.6cm
C.<1.4cm
D.上限值为1.5cm
E.1.2~1.5cm
参考答案:C
25℃时,某溶液中由水电离产生的C(H+)和C(OH-)的乘积为1×10-20,下列说法正确的是( )
A.该溶液的pH一定是10
B.该溶液不可能pH=4
C.该溶液的pH不可能是7
D.不会有这样的溶
“I was touched by the children here who called me ‘Grandpa Wen’ because that’s _______the Chinese children call me at home,” said former premier Wen Jiabao in India.
A.how
B.what
C.why
D.when