—I will have an important test tomorrow. I feel stressed now.—__________ and believe youself. You will pass it.
A:I'm sorry to hear that
B:Sure, I'd love to
C:Ok.
D:Take it easy.
如图电路中,当只闭合开关S2时,L1、L2 ____联;当闭合开关S1、S3时,L1、L2 ____联;当同时闭合S1、S2、S3时,电路会发生 ____,损坏电源.
下列对实验现象的预测不正确的是( )
已知x=-1y=0和x=2y=3都是方程y=ax+b的解,求a和b的值.