下列字符串中非法字符串为( )。
A.’a string’
B.’It is a’string’.’
C.”a string”
D.”It is a’string”
参考答案:B
– I feel nervous before the exam.
-- _____ . It won’t be too difficult for you to pass.
A.Take it easily
B.Take it easy
C.Take your time
D.Take that easy.
80C51单片机的片内RAM低128单元分哪3个主要部分?各部分的主要功能是什么?