点火装置按其组成和产生高压电的方式不同有（）、（）和（）三种点火装置。
参考答案：蓄电池；磁电机；晶体管
根据句意，用括号内所给单词的适当形式填空。
小题1:---How is your business going?
--- It couldn’t be _______ (bad).
小题2:Each of us _______ (breath) heavily after running on the playground every morning.
小题3:For everyone’s _______ (safe), we should always remember the law against driving after drinking.
小题4:Such a camera can help spacemen film _______ (they) during the flight.
将下列字符的ASCII码值进行比较，正确的一项是______。
A．4>空格字符
B．w
C．I<3
D．a>A
