已知A(a,2)与B(-3,2)关于y轴对称,则a=______.
根据平面直角坐标系中对称点的规律可知:
A(a,2)与B(-3,2)关于y轴对称,则a=3.
you may have, you should gather your courage to face the challenge.
A.However a serious problem
B.What a serious problem
C.However serious a problem
D.What serious a problem
柴油机的可燃混合气是在()内形成的。
A、进气管
B、进气行程
C、化油器
D、燃烧室