检验集气瓶里是否集满CO2的方法是( )
A.倒入澄清的石灰水并振荡
B.用燃着的木条伸入集气瓶里
C.用燃着的木条伸入集气瓶口
D.用带火星的木条伸入集气瓶口
答案:C
He had a wide _______ of interests, which made him a popular person that all of us like to make
friends with.
A.world
B.variety
C.various
D.difference
法洛四联症有主动脉骑跨,主肺动脉关系异常。()