鉴别假币的方法有哪几种？
参考答案：
直观法，手摸法，记忆法，质感法，丈量法。
It has been proved ___ eating vegetables in childhood helps to protect you against serious illnesses in later life.
A．if
B．because
C．when
D．that
CMOS的缺点是（）
A、工作速度较慢
B、比较费电
C、清晰度差
D、噪声大
