汽车电气的关键部分是:电源系统、发动机起动系统、发动机点火系统。
参考答案:对
I’m going to buy my daughter another interesting novel, _______ she would like to read.
A.that
B.what
C.one
D.it
时间继电器用于控制电路中,使被控制的元件或设备按指定的时间作动()作。
A.延时;
B.顺时;
C.及时.